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Keeping the cooling system in good shape is essential for the 2013-2017 Subaru Crosstrek to run reliably and avoid overheating or premature component wear. The right coolant protects aluminum heads, water pump seals, and the radiator while offering predictable service intervals and freeze/boil protection that match your climate and driving habits.This guide shortlists the top coolant options for the 2013-2017 Crosstrek, explaining the evaluation criteria used and what to expect from each type. Read on to understand how longevity, corrosion inhibitors, and compatibility with Subaru systems influence your choice, and to see the top picks for common maintenance tasks and coolant flushes.
Looking for other parts? See all Subaru Crosstrek parts & accessories.
Top Picks at a Glance
| Best Overall Coolant Balanced choice for reliability, protection, and broad compatibility | Zerex Asian Vehicle Blue Prediluted 50/50 Antifreeze/Coolant, 1 Gallon |  |
| Best Premium Coolant Higher-end formula with advanced additives and extended protection | Subaru Super Coolant Blue Prediluted 50/50 1 Gallon |  |
| Best Long-Life Coolant Formulated for extended change intervals and durable corrosion control | PEAK OET Extended Life Green Concentrate Antifreeze/Coolant (1 Gal) |  |
| Best Concentrated Coolant Undiluted concentrate that lets you custom-mix to exact strength | PEAK OET Extended Life Blue Concentrate Antifreeze/Coolant (1 Gal) |  |
| Best OAT Coolant Organic acid technology formula for modern alloy and mixed-material systems | Zerex Asian Vehicle Blue Antifreeze/Coolant Concentrate (1 Gallon) |  |
1. Zerex Asian Vehicle Blue Prediluted 50/50 Antifreeze/Coolant, 1 Gallon
Best Overall Coolant
| Brand | Zerex by Valvoline |
|---|---|
| Formulation | Prediluted 50/50 HOAT |
| Compatibility | Made for Asian vehicles requiring blue silicate-free coolant |
| Contains | No silicates, borates, amines, nitrites or 2-EHA |
Zerex Asian Vehicle Blue is a ready-to-use, 50/50 HOAT antifreeze intended as a direct replacement for vehicles that specify a blue, silicate- and borate-free formula. It is typically used for topping off or doing a full coolant flush and provides corrosion and scale protection for aluminum and other cooling-system metals thanks to its phosphate-enhanced chemistry. The prediluted gallon simplifies service by removing the need to mix concentrate, and the formula is free of silicates, borates, amines, nitrites, and 2-EHA which reduces the chance of deposit formation in systems that require a silicate-free coolant. Practical benefits include long-life protection aimed at minimizing radiator and water-pump wear and straightforward compatibility with Asian vehicle specs listed by many manufacturers. The main limitation is that it is tailored to vehicles calling for a blue HOAT, so it should not be used where a different coolant chemistry or color is specified; also prediluted fluid means you must account for freeze/boil protection specific to a 50/50 mix and cannot vary concentration for extreme climates.
Best for: Owners maintaining a 2013–2017 Subaru Crosstrek who want a factory-replacement style coolant that simplifies service and prioritizes long-term corrosion protection.
Less Ideal for: Those who need a different coolant chemistry, want to adjust concentration for extreme cold or track use, or require a coolant specified by Subaru that is not blue HOAT should choose an alternative.
- Ready-to-use 50/50 mix removes need to dilute and simplifies maintenance.
- HOAT formula with phosphate additive targets corrosion and scale protection for aluminum components.
- Silicate- and borate-free formulation reduces risk of harmful deposits in systems that require that chemistry.
- Formulated specifically for vehicles requiring a blue HOAT coolant so not suitable for systems needing a different chemistry.
Verdict: The best all-around coolant that balances corrosion protection, freeze/boil performance, and compatibility for most routine automotive maintenance needs.
2. Subaru Super Coolant Blue Prediluted 50/50 1 Gallon
Best Premium Coolant
| Formulation | Prediluted 50/50 |
|---|---|
| Volume | 1 Gallon |
| Manufacturer | Subaru |
| Cold protection | to -62°F |
This Subaru Super Coolant comes prediluted 50/50 in a one-gallon jug, so it is ready to pour into the cooling system without mixing. It uses organic corrosion inhibitors to protect aluminum and other cooling components and is formulated for extended protection and thermal stability, helping reduce the need for frequent coolant changes. The coolant also includes a bittering agent and advertises cold-weather protection to about -62°F, which is useful for year-round driving. For a 2013–2017 Crosstrek the factory-formulated chemistry matches Subaru service recommendations and simplifies maintenance. The main trade-off is higher cost compared with generic concentrates and the fixed 50/50 mix leaves less flexibility for custom dilution in extreme climates. Also, as a branded Subaru fluid it is intended for owners who want factory-specified fluid rather than a universal aftermarket product.
Best for: Buyers who prioritize factory-specified fluid and long-term corrosion protection and are willing to pay extra for a ready-to-use premium coolant for a 2013–2017 Crosstrek.
Less Ideal for: People who prefer to mix concentrate themselves to save money or who need a coolant specifically tailored for non-Subaru vehicles or unusual aftermarket cooling setups.
- Prediluted 50/50 ready to use with no mixing required
- Formulated with organic corrosion inhibitors for long-lasting protection
- Factory-formulated for Subaru vehicles, matching manufacturer chemistry
- Provides extreme cold protection down to about -62°F
- Higher price compared with generic aftermarket coolants
Verdict: The best premium coolant for users willing to pay more for superior corrosion inhibitors, longer service intervals, and enhanced thermal stability.
3. PEAK OET Extended Life Green Concentrate Antifreeze/Coolant (1 Gal)
Best Long-Life Coolant
| Volume | 1 gallon |
|---|---|
| Formulation | Concentrate |
| Chemistry | Phosphate-enhanced OAT |
| Recommended use | Flush, fill, or top off cooling system |
This concentrated PEAK OET Extended Life Green coolant is a phosphate-enhanced organic acid technology formula intended for Asian vehicles and sold as a 1 gallon bottle for DIY flushing, filling, or topping off. Mixed to the recommended dilution it provides extended corrosion protection for aluminum and cast-iron cooling system components and is compatible with other extended-life coolants of similar chemistry. Notable features include its concentrate format, which is convenient for full-system flushes, and the brand guarantee of long service life when used as part of a complete flush and fill. For a 2013–2017 Subaru Crosstrek, this product can be used only if the vehicle’s factory service information allows a phosphate-enhanced OAT coolant in green and the correct coolant type is specified; when compatible, it helps reduce how often you need to replace coolant and keeps inhibitors effective over longer intervals. Limitations: you must verify Crosstrek coolant specifications before use, mix concentrate to the proper 50/50 ratio, and perform a full flush and fill to claim the extended-life guarantee.
Best for: DIYers who prioritize long service intervals and want a concentrated extended-life coolant for scheduled flush and fill maintenance on compatible vehicles.
Less Ideal for: Anyone unwilling to confirm factory coolant specifications for the 2013–2017 Crosstrek or who prefers ready-to-use prediluted coolant without mixing or a different inhibitor chemistry.
- Concentrated formula suited to full-system flushes and custom mixing.
- Phosphate-enhanced OAT chemistry formulated to protect aluminum cooling components.
- Designed for long service intervals when installed as part of a complete flush and fill.
- Compatible with other extended-life coolants of similar chemistry.
- Requires correct vehicle compatibility check before use to avoid mixing incompatible chemistries.
Verdict: The best long-life coolant for DIYers who prefer extended service intervals and sustained inhibitor performance between coolant changes.
4. PEAK OET Extended Life Blue Concentrate Antifreeze/Coolant (1 Gal)
Best Concentrated Coolant
| Volume | 1 gallon |
|---|---|
| Technology | Phosphate-enhanced Organic Acid Technology (POAT) |
| Vehicle focus | Designed for Asian vehicles |
| Concentration | Concentrate (undiluted) |
PEAK OET Extended Life Blue Concentrate is a one-gallon, undiluted coolant designed for systems that require a blue POAT-style formula. You mix it to the dilution you need, so it is practical for flushing and refilling a Subaru Crosstrek cooling system or for topping off to an exact freeze/boil ratio. The concentrate claims extended-life corrosion protection and compatibility with other extended-life formulations, and includes a bittering agent to discourage ingestion. In use you get the flexibility to set a 50/50 or heavier mixture depending on climate, and the bottle size is convenient for a full flush and fill. Keep in mind the label targets Asian makes and the formula is phosphate-enhanced, so always confirm your vehicle manufacturer coolant spec before swapping fluids. Also this product requires correct mixing and proper disposal of old coolant, so it is less convenient than pre-mixed options for someone who wants a ready-to-use bottle.
Best for: Buyers who want control over coolant concentration and plan to do a flush, refill, or precise top-off on their Subaru Crosstrek will appreciate this concentrate. It suits owners who prefer to set freeze and boil protection for local climate conditions.
Less Ideal for: Drivers who prefer a ready-to-use product or who are uncomfortable mixing fluids and disposing of drained coolant should choose a prediluted option or have a shop perform the service.
- Concentrated one-gallon bottle provides flexibility to mix to exact freeze/boil protection ratios
- Formulated as an extended-life POAT coolant for corrosion and rust protection
- Sold as a concentrate suitable for full system flush and refill or precise top-off
- Compatible with other extended-life coolants when mixed according to directions
- Requires correct dilution and handling since it is not pre-mixed
Verdict: The best concentrated coolant for users who prefer buying undiluted fluid to mix to a precise freeze/boil protection ratio or to top off system-specific concentrations.
5. Zerex Asian Vehicle Blue Antifreeze/Coolant Concentrate (1 Gallon)
Best OAT Coolant
| Brand | Zerex |
|---|---|
| Model | Asian Vehicle Blue |
| Form | Concentrate |
| Manufacturer | Valvoline |
Zerex Asian Vehicle Blue is a hybrid organic acid technology (HOAT) concentrate designed to protect aluminum and mixed-metal cooling systems found in many Asian vehicles. It is used either to top off the radiator or for complete coolant flushes after diluting 50/50 with water, delivering extended freeze and boil protection and corrosion resistance for radiators, water pumps and other cooling components. The formula is silicate- and borate-free and includes phosphate additives to help prevent scale and rust while avoiding chemicals like amines and nitrites. In practice the concentrate flows well, is safe for common cooling-system plastics and gaskets, and is backed by a long service life claim suitable for multi-year use. Important limitations are that it must be mixed to the correct ratio for specified temperature protection and that HOAT chemistry differs from pure OATs used by some manufacturers, so confirm compatibility before switching coolants in a Subaru Crosstrek.
Best for: Drivers who prioritize long-lasting, inhibitor-rich coolant protection for aluminum and mixed-metal systems in a 2013–2017 Subaru Crosstrek and want a concentrated product they can mix to spec.
Less Ideal for: Drivers who prefer the exact factory-specified pure OAT formula without phosphate additives or who do not want to mix concentrate themselves.
- HOAT formulation with phosphate additive protects aluminum and mixed-metal systems from corrosion and scale.
- Silicate-, borate-, amine- and nitrite-free formula reduces risk of deposits and chemical incompatibilities.
- Concentrate lets you mix to the exact 50/50 ratio for typical all-season protection or stronger mixes for extreme cold.
- Designed to be safe for cooling-system plastics, gaskets and hoses commonly found on Asian vehicles.
- Long service-life formulation suitable for multi-year maintenance intervals.
- HOAT chemistry is not identical to pure OAT coolants so verify vehicle manufacturer coolant spec before use.
Verdict: The best OAT coolant for owners seeking an organic acid-based formulation designed to protect aluminum and mixed-metal cooling systems with long-lasting inhibitors.
Choosing the Right 2013-2017 Subaru Crosstrek Coolant: Key Factors to Consider
Inhibitor Chemistry and Compatibility
The coolant's corrosion inhibitors determine how well it protects aluminum heads, the radiator, and water pump components in the Crosstrek. Subarus from 2013 to 2017 use aluminum and various seal materials that react differently to inorganic versus organic inhibitor packages.
Choosing a coolant whose inhibitor chemistry is compatible with Subaru-specified materials reduces the risk of accelerated corrosion, seal swelling, or gasket degradation. If you top off with a different inhibitor type than what is already in the system you may shorten service life, so confirm compatibility before mixing fluids.
Service Life and Maintenance Interval
Long-life coolants can reduce the frequency of full system drains and refills, which is valuable if you prefer lower maintenance cadence. However, a claimed extended interval only matters if the inhibitor package remains effective under real driving conditions and at the heat cycles experienced by the Crosstrek.
Consider the stated service life in miles or years and whether the product offers clear guidance for monitoring coolant condition. If the vehicle has an older maintenance history, a complete flush may be prudent before switching to an extended-life formula.
Freeze and Boil Protection
Coolant must provide adequate freeze protection in cold climates and hold boiling point when the engine is under load. The correct concentration of ethylene glycol or propylene glycol and the proper mixture ratio with water determine both freeze point and boiling point performance.
For Crosstrek owners driving in winter, check the recommended dilution figures and use distilled water to avoid mineral deposits. For heavy towing or sustained high-load driving, aim for mixtures that raise the boiling point while maintaining corrosion inhibitors' efficacy.
Compatibility with Rubber and Plastic Components
Hoses, O-rings, and the thermostat housing in the Crosstrek are made from elastomers that can be sensitive to certain additive packages. A coolant that is chemically compatible preserves hose flexibility and seal integrity over time.
Review technical data to confirm the fluid is safe for common automotive elastomers. If your vehicle has aging hoses or seals, plan inspections when you change coolant to detect any early deterioration caused by incompatible fluids.
Ease of Use During a Coolant Flush
Practical maintenance considerations matter when performing a coolant flush on the Crosstrek. Some coolants recommend specific drain and refill steps, while others require system bleeding procedures to remove trapped air.
Choose a product with clear instructions that align with the vehicle's cooling system layout. If you perform your own maintenance, look for fluids that mix easily, include visible concentration indicators, or come with instructions tailored to standard flush and refill methods.
Clarity of Mixing Ratios and Technical Documentation
Accurate mixing ratios affect protection levels and component compatibility. Products that provide explicit dilution tables for different climates and clear guidance on testing concentration make it simpler to maintain correct freeze and boil protection.
Good technical documentation also helps service technicians and DIY owners confirm compatibility with Subaru recommendations. Prefer coolants that publish material safety data sheets and corrosion test results rather than vague performance statements.
When To Replace Coolant In a 2013-2017 Crosstrek
Routine replacement intervals depend on the coolant type previously used and the vehicle's service history. For vehicles with documented recent coolant service using an extended-life formula, intervals can be longer; for unknown or mixed fluids, a full flush is usually safest.
Symptoms that signal a coolant change include discolored or murky fluid, persistent low level despite no visible leaks, overheating, or coolant odor in the engine bay. During any coolant service, inspect hoses, clamps, and the radiator for evidence of corrosion or soft spots.
- Check coolant color and clarity during regular oil or inspection services.
- Consider a flush if service history is unknown or if you detect contamination.
- Perform a pressure test to confirm the system is leak-free before refilling.
How to Do a Proper Coolant Flush on the Crosstrek
A proper coolant flush for the Crosstrek involves draining the old coolant, flushing the system with water until clear, and refilling to the recommended concentration, followed by correct bleeding to remove air pockets. Use distilled water for mixing to avoid mineral deposits.
Follow a step-by-step approach: run the engine to operating temperature with the heater on to open the heater core, drain the radiator and engine block if accessible, refill and cycle the system, then top up after bleeding. Pay special attention to the bleed valves or overflow reservoir to ensure no trapped air remains.
- Run engine warm with heater on before draining to circulate additives and open valves.
- Drain from the radiator petcock and, where possible, from the engine block for more complete removal.
- After refilling, follow the manufacturer's bleeding sequence or run the engine at idle until thermostat opens and top off.
Choosing Between Ethylene Glycol and Propylene Glycol Formulas
Ethylene glycol is the most common base for passenger-vehicle coolants and tends to offer predictable freeze and boil protection. Propylene glycol is often marketed as a less toxic alternative, which may be a consideration for households with pets or frequent spill risk.
For the Crosstrek, the critical factor is not just base glycol type but the inhibitor package and compatibility with Subaru-specified materials. Ensure that the chosen formula provides the necessary corrosion control for aluminum components regardless of glycol base.
- Ethylene glycol typically offers established performance profiles.
- Propylene glycol may be preferable for lower toxicity concerns, but check compatibility.
- Focus on inhibitor compatibility with aluminum and elastomers above glycol type.
Mixing Ratios and Climate Considerations
Adjust the coolant-to-water ratio to match local winter severity and summer operating conditions. A 50/50 mix is common for balanced freeze and boil protection, but more concentrated mixtures increase freeze protection at the cost of heat transfer efficiency.
For the 2013-2017 Crosstrek, use distilled water when mixing and consult concentration charts to maintain both corrosion protection and thermal performance. Overly concentrated mixtures can reduce heat transfer, so follow manufacturer guidance when deviating from 50/50.
- 50/50 is a practical baseline for mixed climates.
- Use more concentrated mixes only when extreme cold requires it, and after checking thermal performance tradeoffs.
- Always use distilled or deionized water to prevent mineral buildup.
Signs of Incompatible Coolant or Additive Abuse
Mixing different inhibitor types or adding random stop-leak products can cause sludge, gel formation, or rapid loss of corrosion protection. On the Crosstrek, this may show up as clogged heater cores, reduced heater output, or accelerated corrosion on radiator surfaces.
If you detect sticky or sludgy residue in the cooling system during a flush, plan for a more thorough cleaning and consider returning the system to a single, compatible inhibitor chemistry before refilling.
- Look for sludge, unusual color changes, or gummy deposits during a drain.
- Avoid mixing inhibitor chemistries unless the product documentation explicitly permits it.
- If in doubt, perform a full flush with water and refill with a compatible extended-life formula.
Still looking for the perfect fit?
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How We Chose the Best 2013-2017 Subaru Crosstrek Coolant
We focused on fluids that meet the specific material and performance needs of the 2013-2017 Subaru Crosstrek cooling system. Selection began with compatibility with Subaru-specified inhibitor chemistries and corrosion protection for aluminum engine components, then prioritized formulas with proven freeze and boil protection across a range of concentrations.Evaluation criteria included inhibitor technology and stability, stated service life or extended-life claims, compatibility with OEM elastomers and seals, and compatibility with common coolant flush procedures. We also considered manufacturer documentation on dilution ratios and whether the coolant supports both summer and winter protection without requiring frequent top-ups.We excluded generic, unspecified antifreeze blends and products lacking clear technical data on corrosion protection or material compatibility. Performance claims without supporting specifications were not considered. The final shortlist emphasizes fluids that balance corrosion control, long drain intervals, ease of use during a coolant flush, and clarity on mixing ratios so owners can maintain reliable cooling performance in the Crosstrek.
Our full evaluation process is outlined in our review methodology.
FAQ
Can I top off my Crosstrek with any coolant if the level is low?
Topping off with any coolant type is not recommended because mixing incompatible inhibitor chemistries can reduce corrosion protection. If you need an emergency top-off, use distilled water and schedule a proper flush and refill with a compatible coolant as soon as possible.
How often should I perform a coolant flush on a 2013-2017 Crosstrek?
Interval depends on the coolant type previously used. For documented extended-life coolants, intervals can be several years; for unknown fluids or if contamination is present, a flush is advisable immediately and then follow the chosen product's stated service interval.
Does coolant type affect my Crosstrek's heater performance?
Yes. Old, contaminated, or improperly mixed coolant can reduce heat transfer and heater output. Using the correct concentration and ensuring the system is free of sludge and air will help maintain consistent cabin heating.
Is propylene glycol coolant safe to use in the Crosstrek?
Propylene glycol-based coolants can be used if they provide the right inhibitor package and are compatible with Subaru materials. The choice between glycol bases is secondary to ensuring the inhibitor chemistry and documentation match the vehicle's needs.
Will switching to a long-life coolant cause problems if my vehicle has old coolant present?
Switching can be beneficial, but mixing new extended-life inhibitors with unknown or degraded coolant may reduce effectiveness. A full system flush before switching is often recommended to ensure the new inhibitor package performs as intended.
Final Verdict
Prioritize inhibitor compatibility, service life, and clear mixing guidance when choosing coolant for the 2013-2017 Subaru Crosstrek. Corrosion protection for aluminum components and compatibility with elastomers and seals are the most important factors affecting long-term reliability. If the coolant history is unclear, perform a full flush before switching to an extended-life formula to avoid mixing incompatible chemistries. By focusing on documented compatibility and following proper flush and bleed procedures, you can choose a coolant that balances protection, maintenance interval, and reliable thermal performance.
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