Note: This article contains affiliate links. If you click on these links and make a purchase, I may earn a small commission at no extra cost to you. This helps support my research and content. Read my full affiliate disclaimer here.
If you drive a GMC Acadia, the condition of the oil cooler lines matters for engine temperature control and long-term reliability. Worn or leaking lines can reduce cooling efficiency and create a mess, while properly fitted replacements restore consistent oil flow and lower the risk of overheating. This guide presents the top shortlisted options for GMC Acadia oil cooler lines, selected for their compatibility and construction. We evaluated candidates for durability and ease of installation to help you pick the best fit for routine maintenance or repair.
Looking for other parts? See all GMC Acadia parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | A-Premium Inlet Transmission Oil Cooler Line Hose Assembly |  |
| Best Budget The cheapest option that still gets the job done reliably | A-Premium Lower Engine Oil Cooler Line Hose Assembly |  |
| Most Sold A high-volume bestseller chosen again and again | A-Premium Engine Oil Cooler Line Hose Assembly for Chevrolet Express/GMC Savana (2003–2007) |  |
| Best Value for Money The sweet spot between price and what you get | A-Premium Engine Oil Cooler Line Hose Assembly (Inlet and Outlet) |  |
| Best Overall The best all-around choice for most situations | Generic Stainless Steel Braided AN6 Transmission Cooler Line Kit, 52" |  |
1. A-Premium Inlet Transmission Oil Cooler Line Hose Assembly
| Fitment | GMC Acadia 2007-2019 (varies by year; inlet from radiator lower) |
|---|---|
| Material | Metal and hose assembly |
| Hose maximum pressure | 100 PSI |
| Manufacturer part number | APOCL243 |
This A-Premium inlet transmission oil cooler line replaces the factory inlet hose on compatible GMC Acadia models and routes transmission fluid from the radiator lower connection to the transmission. Built as a direct replacement, the assembly combines metal tubing with a hose section and is intended for straightforward swap-in installation where the original line has corroded or leaked. Notable features include listed OEM reference numbers for cross-checking fit, a stated maximum hose pressure of 100 PSI, and a one-year unlimited-mileage guarantee from the maker. In practice this part is used when a leaking or damaged cooler line causes fluid loss or overheating risk; buyers report that bends and connections match factory routing for easy fitment on Acadia applications. Limitations to consider are that differences in the tube end geometry versus some originals were reported by a few users, and using a replacement line still requires careful inspection of fittings and clamps to avoid leaks after installation.
Best for: Reliability-focused buyers who prioritize a dependable, factory-style replacement to restore the transmission cooling system and avoid future leaks.
Less Ideal for: Drivers seeking a universal or multi-vehicle solution or those who prefer a full kit with extra fittings and clamps should consider other options.
- Direct-replacement design intended to match factory routing for easier installation on compatible GMC Acadia models
- Includes OEM reference numbers to verify correct fit before purchase
- Metal tubing plus hose section provides rigidity where needed and flexible connection at the radiator or transmission
- Stated hose maximum pressure of 100 PSI suitable for normal transmission cooling system pressures
- Some users noted minor differences at the transmission connection which may require attention during installation
- Does not include vehicle-specific installation hardware such as clamps or additional fittings
Verdict A practical, reliability-minded direct-replacement inlet cooler line for GMC Acadia owners needing a factory-style fix to transmission cooling leaks.
2. A-Premium Lower Engine Oil Cooler Line Hose Assembly
| Manufacturer Part Number | APOCL006 |
|---|---|
| OEM Part Number | 625-107, 5801001, 12472278 |
| Fitment Type | Direct Replacement |
| End 1 Type | Male Threads |
| End 2 Type | Quick Disconnect |
This lower oil cooler line assembly replaces the factory line that carries engine oil between the cooler and engine. It is built as a direct replacement with one male-threaded end and one quick-disconnect end, intended for straightforward swap-in installation where access and clips are standard. The rubber-and-metal construction gives the flexibility to follow factory routing while the included reference numbers help verify fitment. In practice the part serves routine repair or maintenance needs when a hard line has failed, leaking, or been removed for service. Buyers should expect a simple part that restores oil flow without upgrading performance. Fitment must be checked carefully because application is specific to certain 1994–1995 GM V8 models and a wrong match is the most common issue. The listing notes a one-year unlimited-mileage guarantee which offers some after-purchase protection but does not replace checking vehicle compatibility first.
Best for: Budget-conscious buyers looking to repair an oil cooler line affordably and get their vehicle back to service without modifying the cooling system.
Less Ideal for: Drivers seeking a performance or heavy-duty aftermarket upgrade, or anyone with a different model year or engine not listed should look for a line matched to their exact vehicle fitment.
- Direct-replacement design for straightforward swap with factory routing
- Mixed rubber and metal construction balances flexibility and durability
- Male-thread and quick-disconnect ends match common factory connections
- Fitment is limited to specific older GM V8 models so incorrect selection is possible
- Not an upgraded performance line — intended only as a like-for-like replacement
Verdict A low-cost, factory-style replacement oil cooler line for specific older GM V8 models that works well when you need an affordable, direct swap.
3. A-Premium Engine Oil Cooler Line Hose Assembly for Chevrolet Express/GMC Savana (2003–2007)
| Material | Steel |
|---|---|
| Fitment Type | Direct Replacement |
| Reference Numbers | 625-300, 5801296, 10398398, 15808245, 625300 |
| Compatible Engines | V8 4.8L and V8 6.0L |
This oil cooler line assembly replaces the factory oil cooler feed/return lines to route engine oil to the cooler and back. It is sold as a direct replacement made from steel and intended to bolt in where the original lines were located. Typical use is routine repair or preventative replacement during a cooling or oil system service when a leaking or corroded line is found. The steel construction and corrosion-resistant finish aim to provide a durable, leak-free connection and the listing includes multiple factory reference numbers for fit verification. In practice this part installs like a factory-quality line but a handful of user reports note variability in durability compared with OEM parts, so careful inspection at install and proper clamps are recommended. The line covers common V8 4.8L and 6.0L fitments for the Chevrolet Express and GMC Savana model years shown, making it a straightforward repair piece when the original line has failed or is corroded.
Best for: Risk-averse mainstream buyers seeking a ready-to-install replacement that restores oil cooler function without major modification for the specified vehicle models.
Less Ideal for: Drivers who prefer strictly factory-sourced parts or who need a higher-duty aftermarket upgrade for heavy towing and extreme-duty use should consider alternative factory-quality or performance options.
- Direct-replacement fit for listed Chevrolet Express and GMC Savana V8 models.
- Steel construction designed for corrosion resistance and leak control.
- Includes manufacturer reference numbers to help confirm compatibility.
- Fits both feed and return oil cooler connections for a complete line replacement.
- Some user reports indicate occasional premature failure compared with factory parts.
- Not guaranteed identical to factory fit and finish across all sellers or remanufacturers.
Verdict A practical steel direct-replacement oil cooler line for the listed Express/Savana V8 models that provides a straightforward repair solution but may vary from factory parts in long-term durability.
4. A-Premium Engine Oil Cooler Line Hose Assembly (Inlet and Outlet)
| Material | Rubber/Metal |
|---|---|
| Maximum Pressure | 1500 Pound per Square Inch |
| Fitment Type | Direct Replacement |
| Gasket or Seal Included | Yes |
This A-Premium oil cooler line assembly replaces the inlet and outlet lines that run between the oil filter area and the radiator oil cooler. It is intended as a direct replacement and is constructed from rubber and metal with corrosion-resistant surfaces and included gaskets for a sealed connection. Typical use is a service or repair where the original cooler lines are leaking, cracked, or clogged; the assembly comes pre-bent and sized to match the factory routing so it installs in place of the worn lines. Practical benefits include a full assembly with both inlet and outlet lines and a high maximum pressure rating that helps resist burst failures under oil pressure. Several buyers noted fitment that requires some careful alignment or slight trimming at the radiator connection, so expect some patience during installation. The product is a budget-friendly aftermarket option that works well when fit is close to factory but may need minor adjustment for a perfect, leak-free seal in some vehicles.
Best for: Practical optimizers who prioritize fixing a leaking or failed oil cooler system on a budget and prefer a ready-to-install replacement assembly they can fit with basic garage skills.
Less Ideal for: Buyers seeking an exact factory-specified part with guaranteed plug-and-play fit without any adjustment should consider a dealer or factory-quality replacement instead.
- Complete inlet and outlet assembly replaces both lines at once for one repair job
- Rubber and metal construction with corrosion-resistant design for durable service
- Includes gaskets or seals to help ensure a sealed connection at install
- High maximum pressure rating (1500 PSI) provides resistance to pressure-related failures
- May require filing or slight adjustment at the radiator fitting for a proper fit
- Aftermarket bends and lengths can be slightly off compared with factory parts, requiring careful alignment
Verdict A cost-conscious full inlet/outlet replacement that gets a leaking oil cooler system working again but may need a bit of tweaking at the radiator connections for a perfect fit.
5. Generic Stainless Steel Braided AN6 Transmission Cooler Line Kit, 52"
| Material | Stainless Steel and PTFE |
|---|---|
| Size | 52inch |
| Nominal Wall Thickness | 0.0625 inches |
| Outside Diameter | 0.38 Inches |
This AN6 transmission cooler line kit provides a ready-made stainless steel braided hose solution for adding or replacing transmission cooler plumbing on a GMC Acadia with compatible fittings. It includes PTFE-lined, stainless-braided hoses and multiple AN fittings and 90-degree adapters so you can route lines from the transmission to an auxiliary cooler or factory cooler. In practice the kit speeds installation for owners who want a corrosion-resistant, flexible hose that holds pressure and resists kinks compared with stock rubber lines. Users report the lines fit common GM transmissions and that the kit simplifies building a cooler loop for towing or heavy city driving. Limitations: the kit is a universal AN6 setup so you may need extra adapters or different fittings to match Acadia factory ports, and quality control appears mixed across batches so inspect connections and test for leaks before finishing the job. Expect to source a couple of vehicle-specific fittings for a perfect, leak-free hookup on the Acadia.
Best for: Convenience-driven owners who want a ready kit to add a transmission cooler or replace aging cooler lines on a GMC Acadia without fabricating hoses from scratch.
Less Ideal for: Owners who prefer a vehicle-specific factory-quality replacement or those unwilling to buy any extra adapters should look for a model-specific kit or have hoses built locally.
- Stainless steel braid with PTFE inner hose offers corrosion resistance and flexibility compared with rubber lines.
- Includes AN6 fittings and 90-degree adapters to simplify routing to an aftermarket cooler.
- Long lengths allow routing to an auxiliary cooler without splicing for many installations.
- Hoses are reported to handle high pressure and towing-related heat loads when installed correctly.
- Universal AN6 fittings may not match GMC Acadia factory ports and can require additional adapters.
- Quality control is inconsistent across units so some buyers reported leaks or incorrect lengths on arrival.
Verdict A convenient, corrosion-resistant AN6 braided hose kit that speeds installation for adding a transmission cooler to a GMC Acadia but may require vehicle-specific adapters and inspection for fitment.
Choosing the Right GMC Acadia Oil Cooler Lines: Key Factors to Consider
Material and Heat Resistance
Oil cooler lines must withstand high temperatures and prolonged exposure to engine oil. Lines made from high-grade materials and reinforced hose constructions resist softening, cracking, and premature failure under thermal stress. Metal or braided hose assemblies often provide better long-term dimensional stability and lower permeation than basic rubber, which matters when lines run near hot engine components.
Choosing a material with proven heat and oil resistance reduces the chance of leaks, swelling, or hose collapse. Consider how the material performs over time in stop-and-go traffic, towing, or towing-equivalent loads that raise oil temperature.
Fitment and Compatibility
Correct fitment is critical for leak-free seals and proper routing. Lines designed specifically for the GMC Acadia will match attachment points, bends, and mounting brackets to avoid strain and chafing. A direct-fit assembly minimizes the need for clamps, adapters, or custom routing, which simplifies installation and lowers the risk of future failures.
Verify that replacement lines align with factory connection types and bracket locations. Poor fitment can cause rubbing against other components, leading to wear and eventual leaks.
End Fittings and Sealing
The quality of the fittings and sealing surfaces determines how well the line resists leaks. Precision-machined fittings, crush-style fittings, or properly sized O-ring interfaces create reliable seals when torqued to specification. Fittings should also be corrosion resistant to maintain sealing integrity over time.
Inspect compatibility with the vehicle's feed and return ports and verify whether replacement parts include necessary seals or require reuse of OEM seals. Proper torque values and clean mating surfaces are essential for a leak-free connection.
Corrosion and Abrasion Protection
Exposure to road salt, moisture, and debris can corrode metal fittings and abrade hose surfaces. Protective coatings, braided outer layers, or routed shielding help prevent damage from external elements and prolong service life. Lines routed without adequate protection are more likely to develop leak points where abrasion occurs.
Choose options with visible abrasion resistance measures or plan for additional shielding in vulnerable sections. Regular inspections are still important, especially after driving on salty or rough roads.
Serviceability and Maintenance
Consider how easy the lines are to inspect, access, and replace in the future. Assemblies that allow partial replacement or use standard fittings make routine maintenance and repairs faster and less costly. Clear access to connection points and straightforward routing reduce labor time during replacement.
Also factor in the availability of replacement seals, clamps, and hardware. Parts that require special tools or hard-to-find components can complicate future repairs.
FAQ
How do I know if my GMC Acadia oil cooler lines are failing?
Common signs include visible oil leaks under the vehicle or around the cooler, a drop in oil level without other apparent causes, or higher than normal oil temperatures. You may also notice oil on nearby components or a strong burnt-oil odor. If you observe any of these symptoms, inspect the lines and fittings for wetness or damage.
Can I replace just a section of the oil cooler line or do I need the whole assembly?
It often depends on the damage location and the line design. Some systems allow replacing a damaged hose segment or fitting, while others use preformed assemblies that are best replaced whole for reliable routing and fitment. Replacing the entire assembly reduces the risk of future leaks caused by mismatched materials or improper routing.
What causes oil cooler line leaks on the GMC Acadia?
Leaks commonly result from material degradation due to heat and oil exposure, abrasive wear from contact with other components, corroded fittings, or failed seals at connections. External impacts or improper installation can also create stress points that eventually leak. Regular visual checks help catch early signs of wear.
Are metal lines better than rubber hoses for the oil cooler on the GMC Acadia?
Metal or braided lines generally offer superior resistance to heat, abrasion, and permeation compared with plain rubber hoses, which can soften and degrade faster under high-temperature conditions. However, metal lines must be properly routed and protected from vibration and corrosion. Choice should balance durability with correct fitment and installation considerations.
Do I need to change the oil when replacing the oil cooler lines?
You may not always need a full oil change, but it is good practice to check oil cleanliness and level after replacing lines. If the system lost a significant amount of oil during the repair, topping off or changing the oil and filter ensures proper lubrication and removes any contaminants introduced during the repair.
How We Chose the Best GMC Acadia Oil Cooler Lines
We focused on components and assemblies specifically suited to the GMC Acadia and prioritized real-world durability and installation clarity. Key evaluation criteria included material construction and resistance to heat and oil exposure, the compatibility and accuracy of vehicle fitment, the quality of end fittings and sealing surfaces, and serviceability for routine maintenance or future repairs. We also examined ease of installation, including whether the part supported direct-fit replacement and straightforward routing, and assessed corrosion resistance and warranty or support considerations where available. Exclusions: items that required vehicle modifications, universal hoses without Acadia-specific fitment, or parts lacking clear fittings documentation were not considered. The result is a list of options that meet practical standards for reliability, longevity, and correct fitment on the GMC Acadia.
Our full evaluation process is outlined in our review methodology.
Conclusion
When choosing oil cooler lines for the GMC Acadia, prioritize correct fitment and durable materials that resist heat, oil exposure, and abrasion. High-quality fittings and proper sealing are essential to prevent leaks and maintain consistent oil cooling. Balance ease of installation and serviceability with long-term corrosion protection. Focusing on those factors will minimize future repairs and keep oil temperatures under control.
Explore More:
- Check out all GMC Acadia parts & accessories
- Explore Cooling System
- Browse all Auto Parts
