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Maintaining the cooling system on a Ford F-250 Diesel is essential to avoid costly engine damage and downtime. The right antifreeze balances freeze protection, boiling-point lift, and corrosion inhibition specific to heavy-duty diesel systems. This guide shortlists seven top-rated antifreezes suited to the F-250 Diesel application and explains the performance and compatibility traits that matter most. You will get clear evaluation criteria, service and mixing guidance, and practical advice to help you pick an antifreeze that matches your vehicle use and maintenance schedule.
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Top Picks at a Glance
| Best Overall Antifreeze A well-rounded coolant that balances protection, longevity, and value | Ford Genuine Antifreeze/Coolant VC-13DL-G |  |
| Best Budget Antifreeze A low-cost coolant that delivers basic protection without frills | Zerex Pre-Charged 50/50 Heavy Duty Antifreeze/Coolant 1 gal |  |
| Best Premium Antifreeze Higher-end formula with advanced additives for maximum protection | Ford Gold Pre-Diluted Antifreeze/Coolant VC-7DIL-B — 1 Gallon |  |
| Best Extended-Life Antifreeze Formulated for long service intervals and reduced coolant changes | Triax All Fleet ELC Coolant & Antifreeze Concentrate (1 Gallon) |  |
| Best Concentrated Antifreeze Concentrate you dilute to custom freeze/boil protection levels | Zerex G05 Phosphate-Free Concentrate Antifreeze/Coolant (1 Gallon) |  |
| Best Pre-Mixed Antifreeze Ready-to-use coolant for quick, no-mix installations and top-ups | Valvoline Multi-Vehicle 50/50 Ready-to-Use Antifreeze Coolant, 1 Gallon |  |
| Best Heavy-Duty Antifreeze Robust formula built for demanding engines and high-heat use | PEAK Final Charge Extended Life Concentrate Antifreeze/Coolant, 1 Gal. |  |
1. Ford Genuine Antifreeze/Coolant VC-13DL-G
Best Overall Antifreeze
| Manufacturer | Ford |
|---|---|
| Model | VC-13DL-G |
| Item Weight | 9.2 pounds |
| Product Type | Antifreeze/Coolant |
This Ford Genuine Antifreeze/Coolant is a ready-to-use cooling system fluid designed to provide corrosion inhibition and freeze/boil protection in compatible engines. It is typically used when flushing and refilling a cooling system or topping off coolant during maintenance. The formula is made to meet Ford specifications, which helps ensure chemical compatibility with factory components and gaskets. Practical benefits include long-term corrosion control for aluminum and mixed-metal systems and stable protection across a wide temperature range, which reduces the need for frequent changes. Because it is a brand-specific formula, it is a straightforward choice for someone restoring factory cooling chemistry or maintaining a Ford powertrain. Limitations are that the listing does not specify concentrate versus pre-mixed ratio details or precise freeze/boil points, so users should follow vehicle service information for correct fill procedures and verify compatibility with aftermarket additives before mixing.
Best for: DIY mechanics who want a factory-matched coolant for maintaining or restoring Ford cooling system chemistry on a diesel F-250 and prefer a straightforward, brand-specified fill.
Less Ideal for: Drivers who need a universal, multi-vehicle coolant with explicit temperature specs on the label or who plan to blend multiple aftermarket additives should consider a different product.
- Factory-formulated to match Ford cooling system chemistry for reliable compatibility
- Provides corrosion protection for aluminum and mixed-metal engine components
- Ready for typical maintenance tasks like system flushes and top-offs
- Widely available in a packaged, vehicle-specific part format
- Product listing does not state exact freeze and boil temperature limits or dilution instructions
Verdict: The best overall antifreeze offers balanced corrosion protection, freeze/boil stability, and compatibility across common cooling systems, making it the safest single choice for most DIY mechanics.
2. Zerex Pre-Charged 50/50 Heavy Duty Antifreeze/Coolant 1 gal
Best Budget Antifreeze
| Formulation | 50/50 prediluted ready-to-use |
|---|---|
| Application | Heavy-duty diesel engines |
| Corrosion inhibitors | Nitrite, low-silicate |
| Guarantee | 3 years / 150,000 miles / 3,000 hours |
Zerex Pre-Charged 50/50 is a ready-to-use antifreeze designed for heavy-duty diesel engines and routine cooling-system service. You pour it in as-is for a top-off or after a flush; the pre-mixed ratio removes the need to dilute with water. The formula is nitrite-charged and low in silicates, which helps protect cylinder liners and other metal parts from pitting, cavitation, corrosion and scale build-up while also including a defoamer to protect gaskets and hoses. It is marketed to meet heavy-duty OEM performance targets and is backed by a 3 year or 150,000 mile/3,000 hour performance claim when used per instructions. Practical strengths for budget-minded DIYers are the convenience of no-mix filling and a focus on long-term metal protection that reduces the frequency of system problems. The main limitations are that it is a specific heavy-duty formulation aimed at diesel use and buyers should confirm it matches Ford F-250 diesel cooling specifications before switching coolants or mixing with other types.
Best for: Cost-conscious DIYers who service diesel trucks and want a convenient, pre-mixed coolant that prioritizes corrosion and freeze protection for routine service intervals.
Less Ideal for: Drivers who need a coolant specified for a different engine type or who require a manufacturer-specified formulation without verification should seek a coolant matched explicitly to their vehicle.
- Ready-to-use 50/50 mix removes need to dilute water at home
- Formulated for heavy-duty diesel engines with nitrite for cavitation and pitting protection
- Low-silicate formula helps reduce scale and extend component life
- Includes corrosion and rust inhibitors to protect radiators and water pumps
- Intended for heavy-duty diesel applications so may not match every passenger-vehicle coolant spec
Verdict: The best budget antifreeze gives reliable freeze and corrosion protection at a low price, ideal for cost-conscious DIYers who need dependable performance for routine service intervals.
3. Ford Gold Pre-Diluted Antifreeze/Coolant VC-7DIL-B — 1 Gallon
Best Premium Antifreeze
| Model | VC-7DIL-B |
|---|---|
| Ready-to-use | 50/50 pre-diluted |
| Package Quantity | One 1-Gallon Jug |
| Standards | WSS-M97B51-A1, ASTM D3306, ASTM D6210 |
This Ford Gold pre-diluted 50/50 antifreeze arrives ready to use and is engineered to meet Ford coolant specifications for extended protection. It is typically poured directly into the cooling system during service or topping off, eliminating the need to mix with water. Notable features include factory recommendation for Ford family vehicles, a bittering agent to discourage ingestion, and compliance with industry standards such as WSS-M97B51-A1 and ASTM D3306, which indicate it contains corrosion inhibitors suitable for aluminum and mixed-metal systems. Practical benefits are simple installation, correct chemistry for Ford engines, and reduced risk of damaging the cooling system from improper blends. The main limitations are that it is a vehicle-specific formula intended for Ford/Lincoln/Mercury applications and comes only as a ready-mixed 1-gallon jug, so professional shops or owners needing large-volume service may need multiple units or bulk sourcing.
Best for: Buyers who prioritize factory-recommended chemistry and low-risk, ready-to-use coolant for routine maintenance on Ford-family vehicles and who value longer-lasting inhibitor protection.
Less Ideal for: Shops or technicians who require large bulk quantities or a concentrate they can blend for custom mixes should consider commercial bulk coolant supplies instead.
- Ready-to-use 50/50 mix eliminates the need for dilution and reduces service time
- Meets Ford coolant specification WSS-M97B51-A1 and common ASTM standards for broad corrosion protection
- Factory-recommended formulation for Ford, Lincoln, and Mercury vehicles
- Includes a bittering agent to help prevent accidental ingestion
- Sold only in one-gallon jugs which may be inconvenient for high-volume shops
Verdict: The best premium antifreeze is formulated with superior inhibitors and stability for longer-lasting protection and peace of mind for mechanics willing to pay more for top performance.
4. Triax All Fleet ELC Coolant & Antifreeze Concentrate (1 Gallon)
Best Extended-Life Antifreeze
| Special Features | 1 million mile, 20,000 hours, or 8 years; Full concentrate; Contains bittering agent |
|---|---|
| Model | ELC |
| Manufacturer | Triax Luricants LLC |
The Triax All Fleet ELC is a concentrated extended-life coolant designed for heavy-duty diesel use and long service intervals. It is typically mixed to specification and added to the cooling system of diesel pickups, tractors, and commercial engines to provide corrosion protection for mixed-metal radiators and internal components. Key features include a NOAT formulation with molybdate for cylinder liner cavitation protection, compatibility with many diesel specs, and a bittering agent in the concentrate. In practice this product aims to reduce maintenance frequency by offering protection rated up to 1 million miles, 20,000 hours, or 8 years when used as directed without supplemental additives. It also claims improved heat transfer to help prevent pitting and deposits. Limitations are that it is a concentrate that requires proper dilution and handling, and compatibility should be confirmed against the engine maker's recommended coolant chemistry before use in a specific Ford F-250 diesel application.
Best for: DIY owners who prefer long service intervals and want a diesel coolant that emphasizes extended corrosion and cavitation protection to reduce coolant changes.
Less Ideal for: Drivers who want a ready-to-use, maintenance-free jug or who are unwilling to check manufacturer coolant chemistry before replacing fluid.
- Extended protection claimed up to 1 million miles, 20,000 hours, or 8 years without SCA boosters
- NOAT formulation with molybdate to help prevent cylinder liner cavitation in diesel engines
- Compatible with a wide range of diesel specifications and safe for mixed radiator metals
- Concentrate form lets you control dilution for climate and service needs
- Requires correct dilution and handling which adds steps compared with pre-mixed coolants
- Users must verify chemistry compatibility with manufacturer recommendations for their specific engine
Verdict: The best extended-life antifreeze is engineered to maintain corrosion and thermal protection over extended miles or years, reducing maintenance frequency for DIYers who prefer longer service intervals.
5. Zerex G05 Phosphate-Free Concentrate Antifreeze/Coolant (1 Gallon)
Best Concentrated Antifreeze
| Brand | Valvoline |
|---|---|
| Model | G05 |
| Type | Concentrate |
| Formula | Phosphate-free HOAT |
| Volume | 1 gallon |
Zerex G05 concentrate is a long-life coolant designed to be mixed to the strength you need, making it useful for heavy-duty diesel use in Ford F-250 trucks. The HOAT formulation uses virgin ethylene glycol and low silicate chemistry to protect aluminum and other cooling system metals from corrosion while controlling deposits and scale. It also contains nitrites to help prevent diesel cylinder liner cavitation, which is directly relevant for diesel-powered F-250 engines. Typical use is as a system refill or complete flush and fill; mix ratios (50/50, 60/40, 70/30) let you tailor freeze and boil protection for different climates or towing demands. Practical benefits include long service life, reduced risk of leaks and deposits, and compatibility with many factory cooling systems when the manufacturer specifies a phosphate-free HOAT coolant. Limitations are that it is a concentrate and requires correct mixing and water quality, and you should confirm Ford diesel coolant recommendations and any dealer requirements before switching fluids in a warranty period.
Best for: Buyers who want a flexible, concentrated long-life coolant they can mix to seasonal or heavy-towing needs for a Ford F-250 diesel and who prefer a diesel-protective formulation.
Less Ideal for: Owners who prefer pre-mixed ready-to-use coolant or those instructed by dealer service to use a different specified factory coolant chemistry.
- Concentrated formula allows custom mix ratios for climate and towing needs
- HOAT chemistry protects aluminum and other metals from corrosion
- Includes nitrites to guard diesel cylinder liners against cavitation
- Low-silicate, phosphate-free blend reduces deposit formation and helps flow through radiators and hoses
- Requires accurate mixing and suitable water quality to achieve specified protection levels
- Not a drop-in if a vehicle specifically requires a different coolant chemistry—verify Ford diesel specs first
Verdict: The best concentrated antifreeze lets buyers mix coolant to desired strength, offering flexibility for colder climates or custom cooling system requirements while saving on shipping and storage volume.
6. Valvoline Multi-Vehicle 50/50 Ready-to-Use Antifreeze Coolant, 1 Gallon
Best Pre-Mixed Antifreeze
| Size | 1 Gallon |
|---|---|
| Automotive Fit Type | Universal Fit |
| Flash Point | 250 Degrees Fahrenheit |
| Model | Multi-Vehicle |
This pre-mixed Valvoline Multi-Vehicle 50/50 coolant is designed to be poured straight into a cooling system without mixing, which makes it convenient for quick top-offs and routine maintenance on a Ford F-250 diesel. It uses a patented Alugard Plus additive to be compatible with other ethylene glycol coolants and to protect aluminum and other cooling-system metals from corrosion, scaling, and deposits. The premix covers freeze protection down to minus 34F and boiling protection up to 265F when used as intended, and the formula is engineered not to harm gaskets, hoses, or plastics. Because it is universal-fit for vehicles that call for ASTM D3306-type ethylene glycol coolant, it simplifies service and reduces the chance of dilution mistakes. Limitations: it is a generic pre-mix rather than a vehicle-specific factory replacement, so for fleet maintenance schedules that require a manufacturer-specified fluid you should verify Ford diesel coolant requirements before use.
Best for: Buyers who want a hassle-free, ready-to-pour coolant for quick top-offs or routine coolant maintenance on a Ford F-250 diesel and prefer universal compatibility over manufacturer-specific fluids.
Less Ideal for: Fleet managers or owners following strict manufacturer service specs who require a Ford-specified coolant formulation should consider the factory-recommended product instead.
- Ready-to-use 50/50 mix eliminates measuring and mixing errors
- Alugard Plus additive allows compatibility with other ethylene glycol coolants
- Protects aluminum and common cooling-system metals from corrosion and deposits
- Pre-mixed formula provides freeze and boil protection across a wide temperature range
- Not a vehicle-specific factory replacement specified by some diesel manufacturers
Verdict: The best pre-mixed antifreeze is a ready-to-pour solution that eliminates measuring and ensures correct freeze/boil protection immediately, ideal for quick top-offs and hassle-free DIY maintenance.
7. PEAK Final Charge Extended Life Concentrate Antifreeze/Coolant, 1 Gal.
Best Heavy-Duty Antifreeze
| Volume | 1 gal. |
|---|---|
| Concentrate | Yes |
| Engine types | Diesel and gasoline |
| Manufacturer | OWI |
This concentrated PEAK Final Charge coolant is built for heavy-duty cooling needs and is intended to be mixed with water before use. It contains corrosion inhibitors and a thermal-stable formula that improves heat transfer for high-temperature applications common in turbocharged and diesel engines. In practice it is used to top up or refill the cooling system after proper flushing and dilution and can be blended with other coolants at low contamination levels. The product is marketed for long service life when maintained correctly and its non-abrasive chemistry helps protect water pump seals; a bittering agent is added to discourage ingestion. Limitations to note are that it is a concentrate that requires correct mixing and that compatibility with existing coolant should be managed to keep contamination below recommended thresholds to maintain corrosion protection. For Ford F-250 diesel use, proper flush and following the vehicle manufacturer dilution and coolant-change intervals are important to realize the long-life benefit.
Best for: Buyers who maintain or service high-stress diesel trucks and prioritize a thermal-stable, corrosion-resistant coolant for heavy towing and frequent heavy-load driving on a Ford F-250 diesel.
Less Ideal for: Drivers who want a ready-to-use bottle without mixing or those who do not plan to flush an existing cooling system before replacing coolant.
- Formulated for heavy-duty diesel and gasoline engines with improved heat transfer
- Extended-life chemistry intended for long service intervals with proper maintenance
- Non-abrasive formula that can help protect water pump seals
- Concentrated form allows control over dilution for application needs
- Requires correct dilution and system flushing to avoid performance or compatibility issues
- Mixing with other coolants is limited and contamination must be kept low to maintain corrosion protection
Verdict: The best heavy-duty antifreeze is designed with tougher corrosion inhibitors and thermal stability to protect high-stress or turbocharged engines and frequent heavy loads common in demanding DIY and commercial use.
Choosing the Right Ford F-250 Diesel Antifreeze: Key Factors to Consider
Freeze and Boil Protection
Antifreeze fluid must provide reliable freeze protection at the concentrations you plan to use. Diesel trucks that see seasonal extremes need a mix that prevents freezing in winter while still offering adequate boiling-point elevation in summer when radiators and turbos run hot.
Check the freeze and boil point charts and target the concentration that delivers both low-temperature protection and enough coolant strength to avoid localized boiling. Remember that adding water to a low-alkalinity coolant can reduce its protective properties, so verify performance at the expected mix ratio and ambient extremes you drive in.
Corrosion Inhibition
Diesel engines have multiple metals in the cooling circuit, including aluminum, iron, and various soldered or brazed joints. Effective corrosion inhibitors protect these surfaces, extending radiator, water pump, and head gasket life.
Look for coolants with inhibitor chemistries formulated for mixed-metal protection and with documented inhibitor depletion rates. Longer-lasting inhibitor packages reduce the frequency of drain-and-fill intervals and lower the risk of localized galvanic corrosion in the F-250 Diesel cooling system.
Compatibility with Diesel Additives and Seals
The coolant must be compatible with diesel-specific additives such as lubricity and anti-foaming agents, and must not degrade rubber seals, hoses, or plastic components in the F-250 Diesel cooling and turbo oil-cooler circuits.
Review compatibility claims and manufacturer guidance for elastomer swelling and plastic compatibility. Incompatible chemistry can cause seal hardening or hose softening, which leads to leaks and premature maintenance.
Service Life and Maintenance Interval
Some antifreezes are formulated as long life products, extending drain intervals significantly compared with conventional coolants. For fleet operators or owners who prefer fewer maintenance events, longer service intervals reduce downtime and labor costs.
However, extended-life coolants require correct concentrate and use of approved supplemental coolant additives when topping off. Verify recommended change intervals under severe service and towing conditions typical for many F-250 Diesel owners.
Mixing Requirements and Concentration Control
Correct mixing of antifreeze concentrate and water determines freeze/boil protection and inhibitor strength. Using distilled or deionized water reduces mineral deposits and maintains heat transfer efficiency, while tap water can introduce hardness that affects inhibitor performance.
Carry a refractometer or hydrometer where practical to confirm mix ratio during service. Clear labeling and simple mixing instructions reduce installation errors and ensure the fluid delivers expected protection in the Ford F-250 Diesel cooling system.
Thermal Performance and Heat Transfer
Coolant affects heat transfer between the engine block and radiator. Some formulations prioritize corrosion control at the expense of thermal conductivity, which can lead to higher operating temperatures under heavy towing or sustained highway loads.
Choose a coolant that balances corrosion inhibition with good heat transfer characteristics, especially if you use the F-250 Diesel for towing or heavy loads. Consider how coolant properties interact with radiator design and auxiliary coolers.
Diesel-Specific Coolant Chemistry Explained
Diesel antifreezes often use inhibitor packages tuned to handle the acidic byproducts and higher heat loads associated with diesel combustion. These formulations manage oxygen exposure, cavitation risk in high-compression engines, and the mixed-metal metallurgy in modern cooling circuits.
Understanding the basic types of inhibitor technology helps you evaluate product labels and service intervals. Organic acid technology tends to offer longer inhibitor life, while conventional inorganic inhibitors may require more frequent replacement. Match chemistry choice to your expected service interval and operating conditions.
- Organic acid inhibitors generally provide longer life and less buildup
- Inorganic inhibitors can be effective but often need earlier replacement
- Hybrid formulations blend approaches to balance early and long-term protection
Preparing the Cooling System for a Change
Before switching antifreeze types, perform a cooling system inspection and address any leaks, degraded hoses, or corroded clamps. If the system is heavily contaminated, a complete drain and flush is recommended to remove sediment and spent inhibitor deposits.
Follow safe draining procedures and dispose of used coolant according to local regulations. When topping off between services, use the same chemistry already in the system unless you plan a full flush and refill with the new product.
- Inspect hoses, clamps, and radiator for visible damage
- Pressure-test the cooling system if overheating or leaks are suspected
- Flush the system when switching inhibitor chemistries or when contamination is present
Mix Ratios and Seasonal Considerations
For reliable freeze protection and boilover control, maintain the manufacturer-recommended mix ratio, typically a 50/50 concentrate-water blend for many diesel applications. In extreme cold, a slightly richer concentrate may be needed, while in hot climates the same mix helps raise boiling point and protect against vapor lock.
Remember that mixing with hard water can reduce inhibitor effectiveness and may increase scale formation. Where possible, use distilled or deionized water to maximize performance and longevity of the antifreeze.
- 50/50 is a common recommended starting point for year-round protection
- Use a refractometer to verify freeze point before cold weather
- Consider coolant heaters or block heaters for extreme winters in addition to antifreeze
Maintenance Tips for Longevity
Regularly check coolant level and color, and top off with the same chemistry between services. Keep a log of coolant service dates and concentrations, especially if you tow or operate under heavy loads that accelerate coolant degradation.
Inspect and replace the coolant filter if your truck has one, and monitor for signs of contamination such as oil in the coolant or an unusual smell, which may indicate head gasket issues or turbocharger leaks.
- Check levels monthly and before major trips
- Record service dates and concentrations
- Address cross-contamination or oil intrusion immediately
When to Flush Your Cooling System
Flush intervals depend on coolant chemistry and operating severity. Long life formulations may last longer, but towing, stop-and-go driving, and extreme temperatures can shorten effective service life. Look for manufacturer guidance but be prepared to shorten intervals under severe use.
Perform a visual inspection at every service and flush if you find heavy discoloration, debris, or depleted inhibitor indicators. A preventive flush prevents corrosion and maintains efficient heat transfer.
- Follow the coolant maker and vehicle manufacturer recommendations
- Shorten intervals if you tow frequently or operate in harsh conditions
- Use proper flush procedures to avoid damage to cooling components
Still looking for the perfect fit?
Select your Ford F-250 configuration to see the most relevant Antifreezes recommendations
How We Chose the Best Ford F-250 Diesel Antifreeze
We selected antifreezes for the Ford F-250 Diesel by focusing on the characteristics that matter most in heavy-duty diesel cooling systems. First, we required documented corrosion protection for mixed-metal cooling systems common in Ford diesel engines. Second, freeze and boilover performance at recommended concentrations was a primary filter to ensure winter reliability and summer thermal capacity. Third, long life and extended service intervals were weighted for owners who prefer fewer coolant changes. Fourth, compatibility with diesel additives, seals, hoses, and turbocharger cooling circuits was assessed. Fifth, ease of mixing and clear labeling for concentration and service intervals were considered to reduce installation mistakes.Excluded items included coolants formulated only for gasoline engines, products that require proprietary additives not widely available, and formulations lacking clear technical specs for diesel use. We prioritized fluids that balance corrosion control, thermal performance, and service life, and that provide straightforward mixing and maintenance guidance for F-250 Diesel owners.
Our full evaluation process is outlined in our review methodology.
FAQ
Can I use regular engine antifreeze in the Ford F-250 Diesel?
Often you can use an engine antifreeze formulated for diesel service, but it must meet diesel-specific corrosion and inhibitor requirements. Verify the product states diesel compatibility and supports mixed-metal protection before using it in the F-250 Diesel.
How often should I flush the coolant on a Ford F-250 Diesel?
It depends on the coolant chemistry and operating conditions. Long life coolants can extend intervals, but towing, frequent heavy loads, and extreme climates often justify more frequent flushing. Inspect coolant condition and follow vehicle and fluid maker guidance.
Is a 50/50 mix the right ratio for winter in the F-250 Diesel?
A 50/50 mix is a common baseline offering balanced freeze and boil protection for year-round use. In very cold climates, owners sometimes increase concentrate slightly for extra freeze protection, but always confirm performance at the target mix and follow manufacturer recommendations.
Will mixing different antifreeze chemistries harm my truck?
Mixing incompatible chemistries can shorten inhibitor life and increase corrosion risk. If you must change chemistry, it is best to perform a complete drain and flush before refilling with the new type to avoid adverse interactions.
How can I check coolant concentration quickly?
A handheld refractometer or hydrometer provides a quick read on freeze point and concentration. These tools help ensure you have the correct mix for seasonal protection and are useful during top-offs or post-service checks.
What signs indicate coolant corrosion or degradation?
Common signs include rusty or dark-colored coolant, sediment in the radiator, frequent overheating, or pitting in replacement parts. Any unusual coolant appearance or system performance should prompt inspection and possible flushing.
Final Verdict
Prioritize corrosion protection, correct mix ratio, and service interval when choosing antifreeze for your Ford F-250 Diesel. Diesel-specific inhibitor chemistry and proven freeze/boil performance are more important than marketing claims. Balance long-life formulations against your towing and operating habits, and plan maintenance schedules that reflect the severity of use. With attention to compatibility, mixing, and routine checks, you can maintain reliable cooling performance and reduce the risk of costly engine damage.
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