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If you drive a Buick Regal, keeping oil temperatures in check matters for engine longevity and dependable performance. Choosing the right oil cooler affects operating temperature, oil pressure, and the lifespan of engine components, especially if you tow, drive aggressively, or do a lot of highway miles. This guide highlights our six shortlisted Buick Regal oil cooler options and explains the features we evaluated, including cooling capacity and fitment reliability. Read on to see which attributes to prioritize before shopping.
Looking for other parts? See all Buick Regal parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | Klimoto Radiator 20" with Transmission Oil Cooler for 1965–1988 GM A/G-Body |  |
| Best Quality Built to a higher standard if you want something more solid | Readair Engine Coolant Radiator with Transmission Oil Cooler |  |
| Best Budget The cheapest option that still gets the job done reliably | A-Premium Inlet Transmission Oil Cooler Line Hose Assembly |  |
| Most Sold A high-volume bestseller chosen again and again | A-Premium Engine Coolant Radiator Assembly with Transmission Oil Cooler |  |
| Best Value for Money The sweet spot between price and what you get | A-Premium Engine Oil Cooler with Pipe for Buick Regal |  |
| Best Overall The best all-around choice for most situations | KUIPERAUTO Aluminum Radiator with Transmission Oil Cooler for 2014–2019 Buick Regal 2.0L/2.5L |  |
1. Klimoto Radiator 20" with Transmission Oil Cooler for 1965–1988 GM A/G-Body
| Brand | Klimoto |
|---|---|
| Model | KLI569 |
| Core thickness | 32mm |
This Klimoto radiator is a direct-fit replacement designed for classic GM A/G-Body cars and includes an integrated transmission oil cooler to help manage both engine and transmission temperatures. It uses a folded fin design and a 32 mm core to increase cooling capacity versus thinner cores, and the manufacturer highlights corrosion-resistant coating and thermal cuts to reduce failure from expansion. Typical use is a factory-style swap when an original radiator is leaking, corroded, or undersized for modern driving conditions; installation is intended to be DIY-friendly and can be completed in about 30 to 45 minutes for someone comfortable with basic cooling-system work. The integrated oil cooler and thicker core give practical benefits for towing, spirited driving, or stop-and-go traffic by lowering operating temperatures. Limitations are that this is built for A/G-Body fitment rather than being a universal performance radiator, and buyers should verify hose and mount alignment for a smooth install.
Best for: Reliability-focused owners looking for a factory-style replacement that lowers engine and transmission temperatures in classic Buick Regal-era A/G-Body cars and reduces the risk of overheating during regular driving.
Less Ideal for: Drivers seeking a high-performance universal racing radiator or custom-fit cooling solution for non-A/G-Body vehicles should look at performance-specific aftermarket options.
- Integrated transmission oil cooler reduces transmission temperatures without a separate unit
- 32 mm core and folded fin design improve heat dissipation compared with thinner cores
- Corrosion-resistant coating extends service life in older vehicles
- Vehicle-specific configuration intended for direct fit on 1965–1988 GM A/G-Body chassis
- Fitment is limited to GM A/G-Body vehicles and is not suitable for other makes or models
- May require verification of hose and mounting alignment during installation
Verdict A straightforward, vehicle-specific replacement that improves cooling and adds an integrated transmission oil cooler for more reliable temperature control in classic A/G-Body Buicks.
2. Readair Engine Coolant Radiator with Transmission Oil Cooler
| Transmission Oil Cooler Included | YES |
|---|---|
| Core Height | 20-7/10 inch |
| Core Width | 17-1/5 inch |
| Core Thickness | 1-3/10 inch |
| Inlet Diameter | 1-3/10 inch |
This Readair radiator is an all-in-one replacement that pairs an aluminum cooling core with an integrated brass transmission oil cooler for vehicles that require both components. It is intended for direct-fit installation and is typically used to restore engine cooling and transmission cooling performance after a failed or leaking factory radiator. Notable features include a TIG-welded aluminum core, treated coating, PA66 GF30 inlet/outlet tanks, and factory-style transmission cooler passages. In practice the unit simplifies repairs by combining both functions into one assembly and can save installation time versus fitting separate coolers. Buyers can expect solid cooling capacity when the unit fits correctly and the brass transmission cooler to provide reliable heat transfer for the transmission fluid. Limitations are variable build-quality reports from users and the plastic tank construction, which can be a weak point compared with full-metal alternatives; careful inspection at install and proper mounting are recommended to avoid leaks.
Best for: Performance-oriented buyers who prioritize restoring or improving cooling and transmission temperature control with a single, direct-fit assembly and want a practical upgrade without complex plumbing.
Less Ideal for: Drivers seeking a heavy-duty all-metal radiator for extreme-duty or high-mileage commercial use should consider purpose-built metal units or aftermarket performance radiators instead.
- Integrated brass transmission oil cooler simplifies repair and reduces plumbing compared with separate coolers
- Aluminum core with TIG-welded construction and treated coating aims to improve heat dissipation and corrosion resistance
- Designed as a direct-fit replacement to match factory mounting points for straightforward installation
- Included leak testing at production and polished finish help reduce initial defects and improve presentation
- Plastic inlet/outlet tanks are more prone to cracking than full-metal tanks
- Inconsistent quality control reported by some users, leading to occasional premature leaks
Verdict If you want a single direct-fit radiator that also cools transmission fluid, this Readair assembly is a convenient performance-minded replacement but inspect tanks and fittings closely due to mixed quality reports.
3. A-Premium Inlet Transmission Oil Cooler Line Hose Assembly
| Vehicle Fitment | Buick Regal 2014-2017 L4 2.0L; Chevrolet Malibu 2013-2015 L4 2.0L |
|---|---|
| Location | Inlet |
| Material | Steel and Rubber |
| Maximum Working Pressure (psi) | 250 |
| Fitment Type | Direct Replacement |
This A-Premium inlet transmission oil cooler line is a replacement hose assembly intended for Buick Regal (2014–2017) and Chevrolet Malibu (2013–2015) 2.0L engines. It installs at the inlet side to carry transmission fluid to and from the cooler and is built as a molded steel-and-rubber assembly that matches the original routing. The listing calls out factory part numbers for fit verification and a maximum working pressure of 250 psi, which suggests it is rated for normal transmission system pressures. Practical benefits include a pre-formed shape for easier installation compared with generic tubing and steel/rubber construction that balances rigidity and vibration resistance. Limitations to note are the narrow vehicle fitment—some model-year and drivetrain variants are excluded—and the product requires verification of matching clips or adjacent parts for certain 2013 Malibu builds. Expect a straightforward replacement for owners looking for an affordable, direct-fit line but plan to check compatibility and any associated retainer clips before starting work.
Best for: Budget-conscious buyers who need an affordable, factory-style inlet transmission cooler line replacement for a Buick Regal and prioritize cost-effective direct-fit parts.
Less Ideal for: Buyers who want a universal or upgraded performance line, or owners of vehicles outside the specified model years and drivetrain variants should look elsewhere.
- Direct-replacement molded assembly shaped to match factory routing for simpler installation.
- Steel and rubber construction balances durability with flexibility to resist vibration and kinking.
- Specified maximum working pressure of 250 psi indicating suitability for standard transmission pressures.
- Includes manufacturer part references to help confirm correct fitment for listed models.
- Fitment is limited to specific model years and drivetrain configurations so it is not universally compatible.
- May require additional clips or related parts for certain vehicles which are not included in the listing.
Verdict A cost-effective, molded inlet cooler line that provides a factory-style direct replacement for compatible Buick Regal and Malibu 2.0L models, but check specific year and drivetrain fitment before ordering.
4. A-Premium Engine Coolant Radiator Assembly with Transmission Oil Cooler
| Transmission Oil Cooler Included | Yes |
|---|---|
| Engine Oil Cooler Included | No |
| Reference Numbers | 13146, CU13146, 8013146, 22809025, 23453634, GM3010538 |
This A-Premium radiator assembly replaces the main engine radiator and includes a built-in transmission oil cooler for compatible Buick Regal applications. It is designed to be a direct replacement for factory-style units and is typically used when the original radiator fails, leaks, or when the transmission cooler becomes compromised. Notable features include an integrated transmission oil cooler, multiple factory reference part numbers for cross-checking fit, and a one-year unlimited-mileage guarantee. In practice the combined unit simplifies installation compared with adding a separate transmission cooler and restores both engine and transmission cooling in one step. Important limitations are that it does not include an engine oil cooler and buyers should confirm the exact Regal engine and model year match before purchase because fitment varies by powertrain and options. Expect normal installation work and occasional need to transfer mounting hardware or sensors from the old radiator.
Best for: Risk-averse mainstream buyers who prioritize restoring factory-style cooling performance with a single, factory-replacement radiator assembly and prefer parts that match factory reference numbers.
Less Ideal for: Drivers wanting an upgraded or auxiliary transmission oil cooler solution, or those seeking an engine oil cooler included as part of the assembly, should look at alternative products.
- Integrated transmission oil cooler restores both engine and transmission cooling without separate parts
- Lists multiple OEM reference numbers to simplify verifying vehicle fitment
- One-year unlimited-mileage guarantee for added reassurance
- Designed as a direct replacement for the main radiator to streamline installation
- Does not include an engine oil cooler so additional cooling components require separate purchase
- Fitment depends on engine, year, and options so verification is required before installation
Verdict A straightforward factory-style replacement radiator for Buick Regal applications that includes a transmission oil cooler but not an engine oil cooler.
5. A-Premium Engine Oil Cooler with Pipe for Buick Regal
| Material | Aluminum |
|---|---|
| Gasket or Seal Included | No |
This A-Premium engine oil cooler is a direct replacement-style aluminum cooler intended to restore oil cooling for compatible Buick Regal vehicles. It installs in place of the original unit and includes the cooler and attached oil pipe to simplify fitment. For routine driving the aluminum construction helps transfer heat away from engine oil, which supports stable oil temperatures and can protect the engine under normal and towing loads. The product comes with a one-year unlimited-mileage guarantee from the manufacturer, but it does not include gaskets or seals so you will need to source those separately during installation. Fitment notes list Regal model years covered, so confirm year and engine match before buying. Expect a practical, budget-conscious replacement that delivers core cooling function without premium extras like included seals or extended service parts.
Best for: Practical optimizers who want a budget-conscious, factory-style replacement to restore proper oil cooling on a Buick Regal and prefer a straightforward swap rather than an upgraded performance cooler.
Less Ideal for: Drivers seeking a high-performance aftermarket oil cooler or a kit that includes all installation seals and hoses should consider higher-end or complete kits instead.
- Aluminum construction improves heat dissipation compared with plastic alternatives
- Includes attached oil pipe for easier fitment and fewer separate parts to source
- Covers Buick Regal model fitments specified by the manufacturer, simplifying selection
- Backed by a one-year unlimited-mileage guarantee for replacement cost coverage
- Gaskets or seals are not included, requiring separate purchase for a complete install
- Limited documentation on exact engine variants may require extra verification before ordering
Verdict A practical, value-focused aluminum replacement oil cooler for Buick Regal owners who need a reliable factory-style swap but are prepared to source seals separately.
6. KUIPERAUTO Aluminum Radiator with Transmission Oil Cooler for 2014–2019 Buick Regal 2.0L/2.5L
| Compatible Engines | L4 2.0L / 2.5L |
|---|---|
| Fitment Years | 2014-2019 |
| Core Material | 3003 aluminum |
| Inlet Diameter | 1-3/8 In. |
| Outlet Diameter | 1-3/8 In. |
This KUIPERAUTO aluminum radiator is a full replacement radiator that includes a built-in transmission oil cooler and is offered to fit Buick Regal models with the specified 2.0L or 2.5L four-cylinder engines. It is used as a straight swap for a failed factory radiator to restore cooling and transmission oil cooling capacity. Notable features include a high-density corrugated fin design and 3003 aluminum construction intended to increase heat dissipation and resist corrosion, plus factory-style inlet and outlet sizing for bolt-in fitment. In practice it should regain stable engine temperatures under normal and moderately demanding driving and provides the convenience of an integrated transmission cooler so you do not need a separate unit. Buyers should be aware some users report early leaks at the tank-to-core joint on a minority of units, so careful inspection and proper installation are important. For owners who want a cost-effective replacement that mirrors factory function, this radiator covers the essentials, but those seeking a lifetime upgrade or heavy-duty towing solution may want a heavy-duty aftermarket core or professional reconditioning instead.
Best for: Balanced buyers who want a practical, factory-style replacement radiator that restores engine and transmission oil cooling without extra components or specialty upgrades.
Less Ideal for: Drivers who need an overbuilt cooling solution for regular towing, track use, or who want a premium lifetime upgrade should consider heavy-duty aftermarket cores or professional options instead.
- Includes integrated transmission oil cooler so no separate cooler is required
- 3003 aluminum core and high-density corrugated fins for improved heat dissipation
- Designed for direct fitment to compatible 2014–2019 Buick Regal four-cylinder engines
- Precision tested and marketed as leak tested before shipping
- Some owners report premature leaks between tank and core on a subset of units
- Quality control appears inconsistent across units based on user reports
Verdict A cost-effective, direct-fit aluminum radiator with an integrated transmission oil cooler that restores factory cooling for Buick Regal four-cylinder models but watch for occasional tank-to-core leaks.
Choosing the Right Buick Regal Oil Cooler: Key Factors to Consider
Cooling Capacity
Cooling capacity determines how effectively an oil cooler reduces oil temperature during normal and heavy use. Higher capacity cores move more heat away from the oil, which helps maintain viscosity and protect bearings and seals under stress.
Consider typical driving conditions when evaluating capacity. If you tow, frequently drive at sustained high speeds, or do track days, choose a cooler with greater surface area or more efficient core design. Balance capacity with fitment constraints to avoid excessive pressure drop or incompatible plumbing.
Fitment and Compatibility
Fitment is critical for a direct, leak-free installation specific to the Buick Regal. Correct inlet and outlet locations, mounting points, and clearances around the engine bay affect whether the cooler can be installed without rerouting other components.
Confirm the cooler is designed for your model year and engine variant or that it includes adapters and brackets that match factory oil cooler lines. Poor fitment can lead to additional labor, custom brackets, or compromised hose routing, increasing installation complexity and potential for leaks.
Core Construction and Materials
The core is the heart of an oil cooler. Materials such as aluminum with brazed fins resist corrosion and offer efficient heat transfer, while thicker fins or multi-pass cores can improve cooling at the cost of added bulk.
Durable housings and quality brazing reduce the risk of premature failure or leaks. Consider corrosion resistance for vehicles in wet or salted-road environments, and inspect welds and fittings for robustness when comparing options.
Pressure Drop and Oil Flow
An oil cooler should remove heat without causing excessive pressure drop that could starve the engine of oil. Designs vary in internal passages and flow resistance, so it is important to choose a cooler that maintains adequate oil flow for your engine's oil pump capacity.
Look for specifications or manufacturer guidance on flow rates and recommended oil pressure ranges. For higher-performance or modified engines, ensure the cooler does not restrict flow under peak demand conditions.
Installation Complexity
Installation complexity affects cost and the likelihood of a reliable result. Some coolers offer bolt-on brackets and direct-fit hose ends, while others require additional line kits, adapters, or trimming of nearby components.
Assess whether you will install the cooler yourself or use a technician. Units with clear instructions, included hardware, and straightforward routing to existing oil lines reduce installation time and the risk of leaks. Consider the need for replacement gaskets or seals and whether the cooler requires any system bleeding or special procedures.
Durability and Maintenance
Durability influences long-term value and service intervals. A robust cooler resists vibration, road debris, and corrosion, and allows for occasional cleaning or inspection without damage.
Check whether replacement cores or parts are available, and consider how easy it is to inspect lines and connections for early signs of wear. Regular inspection for leaks and proper hose clamps will extend service life, so favor designs that allow accessible maintenance.
FAQ
How do I know if my Buick Regal needs an oil cooler?
Many signs point to inadequate oil cooling, including consistently high oil temperatures during long drives, frequent heavy loads, or repeated short trips that do not allow full cooling. If you notice oil-related warning lights, unusual engine noise, or faster-than-normal oil degradation during inspections, those can indicate a need. Diagnosis often includes monitoring oil temperature and checking for leaks or pressure anomalies.
Can I install an oil cooler myself on a Buick Regal?
Installation is possible for a competent DIYer if the cooler is a direct-fit unit with included brackets and fittings. Basic mechanical skills, proper tools, and careful routing of oil lines are essential. If the kit requires adapter fittings, custom brackets, or working in tight engine-bay spaces, professional installation is often the safer choice to avoid leaks or routing issues.
Will adding an oil cooler affect oil pressure in my Buick Regal?
Adding a properly sized cooler should not cause harmful oil pressure loss if it is designed for the vehicle and has appropriate internal flow characteristics. Excessive pressure drop can occur with undersized or highly restrictive cores or with improper hose routing. Choose a cooler specified for the application and follow recommended line sizes and fittings to maintain healthy oil pressure.
What are common oil cooler leak symptoms to watch for?
Typical signs include oil spots under the vehicle, a drop in oil level without visible external leaks elsewhere, a sudden change in oil pressure, or visible wetness around connections and the cooler core. Discolored engine bay areas and a faint oily smell after driving can also point to leaks. Regular visual checks help catch leaks early.
Do I need special adapters or line kits for a Buick Regal oil cooler?
Some direct-fit coolers use the factory connection points and require minimal or no additional adapters. Others may need specific adapter fittings or line kits to match inlet and outlet sizes or to relocate the cooler for better airflow. Verify the product's fitment information and included hardware to determine if extra adapters are necessary.
How often should I inspect or maintain an oil cooler?
Inspect the cooler and plumbing at routine service intervals or whenever you perform an oil change. Look for signs of corrosion, loose clamps, or seepage around fittings. Clean external debris from the cooler fins as needed to maintain airflow. More frequent checks are wise if you tow, drive in harsh conditions, or notice temperature fluctuations.
How We Chose the Best Buick Regal Oil Cooler
Our shortlist focused on parts that reliably lower oil temperatures while maintaining proper oil pressure and leak-free operation. Key evaluation criteria included cooling capacity under typical and heavy load, physical fitment to Buick Regal mounting points and hoses, construction quality of the core and housing, and compatibility with factory oil lines and fittings. We also considered materials and corrosion resistance, ease of installation relative to factory routing, and the availability of necessary adapters or line kits. We excluded universal units that require extensive custom fabrication, as well as products with unclear fitment information for the Buick Regal. We prioritized solutions that minimize modifications, preserve OEM oil routing, and offer clear specification data so buyers can match core size, inlet/outlet locations, and mounting provisions to their vehicle.
Our full evaluation process is outlined in our review methodology.
Conclusion
Choosing the right Buick Regal oil cooler comes down to balancing cooling capacity, fitment, and durability. Prioritize a unit that matches your driving habits and the engine's demands while offering secure mounting and reliable connections. Be mindful of installation complexity and potential pressure-drop effects. When you focus on core construction, correct fitment, and manageable installation, you get the best chance of longer engine life and steadier oil temperatures under real-world conditions.
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