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If you drive a GMC Sierra, maintaining proper oil cooling is important for engine longevity and performance. Worn or leaking cooler lines can cause oil loss, higher temperatures, and possible engine damage, so matching the right replacement lines to your truck matters. This guide highlights our top five shortlisted oil cooler lines for GMC Sierra owners, selected based on durability, correct fitment, and leak resistance. We evaluated construction materials and installation considerations to help you choose the best option. Read on for the factors we used and what to watch for during installation.
Looking for other parts? See all GMC Sierra parts & accessories.
Top Picks at a Glance
| Best Overall The best all-around choice for most situations | GM Genuine Parts Engine Oil Cooler Hose Assembly |  |
| Best Quality Built to a higher standard if you want something more solid | ACDelco / GM Genuine Parts Engine Oil Cooler Hose Kit (84828848) |  |
| Best budget The cheapest option that still gets the job done reliably | Psrorkeu Transmission Oil Cooler Line for GMC Sierra 1500 (2007–2014) |  |
| Highest Rated A top-rated pick with lots of positive feedback | A-Premium Automatic Transmission Oil Cooler Line Hose Assembly |  |
| Best Seller A high-volume bestseller chosen again and again | 6AN 70" Stainless Steel Braided Transmission Cooler Hose Kit |  |
1. GM Genuine Parts Engine Oil Cooler Hose Assembly
| Manufacturer | GM Genuine Parts |
|---|---|
| Model | GM Original Equipment |
| Manufacturer Part Number | 85724972 |
| Item model number | 85724972 |
This GM Genuine Parts oil cooler hose assembly replaces the factory connection between the engine and oil cooler and is built to GM validation standards. It is used where the oil cooler circulates hot engine oil back to the engine and must accommodate engine movement and high temperatures. The part comes as a molded assembly designed for a direct replacement fit on compatible GM trucks, and includes the manufacturer part number for straightforward identification. Practical benefits include factory-quality fit and materials that reduce the chance of leaks and simplify reassembly compared with aftermarket hose repairs. Several owners report exact fitment on recent Silverado models, though installation can be tight and time consuming on some engines which may increase labor if you are not doing the work yourself. A small number of buyers reported early failure, so confirm condition on arrival and inspect connections during installation.
Best for: Balanced all-round buyers who prioritize a factory-quality replacement that preserves original cooling performance and fitment on a GMC Sierra.
Less Ideal for: Users seeking a simple DIY quick fix for severe access issues or those who want the lowest-cost aftermarket hose may prefer alternatives or professional installation.
- Factory-validated design tailored for GM vehicles for direct replacement fit
- Built to handle high-temperature oil transfer and engine movement
- Molded assembly reduces leak points compared with pieced-together repairs
- Installation can be difficult and time consuming on some engines
- A few users reported premature failure after installation
Verdict: Choose this GM Genuine Parts hose assembly when you want a factory-quality, direct-fit replacement for your GMC Sierra oil cooler line.
2. ACDelco / GM Genuine Parts Engine Oil Cooler Hose Kit (84828848)
| Brand | ACDelco |
|---|---|
| Model | GM Genuine Parts 84828848 |
| Material | Hose material (e.g., rubber or silicone) |
This ACDelco GM Genuine Parts oil cooler hose kit replaces the factory oil cooler lines and transfers engine oil between the engine and oil cooler. It is supplied as a complete assembly with the bracket, gasket and mounting bolt to restore factory routing and sealing during a repair or upgrade. Because it is manufactured to GM Genuine Parts specifications, fitment and connection points match the original, which simplifies installation for experienced technicians and reduces leak risk. The hose material is specified for high temperature oil transfer so it is suitable for heavy-duty and towing use where oil temperatures run higher. Expect a durable, factory-quality part that gives reliable service life comparable to the original. Installation can be involved on many GM V8 trucks since the lines sit under mounts and tight chassis areas, so plan for a longer labor time or professional installation if you lack the tools or experience.
Best for: Performance-oriented owners who prioritize restoring or upgrading cooling reliability with factory-quality parts and are comfortable paying for a proper repair or having a technician perform the job.
Less Ideal for: Casual DIYers seeking quick, easy projects or anyone who wants a universal aftermarket fix that avoids vehicle-specific installation challenges.
- Factory-quality fit and routing that matches GM original parts
- Includes bracket, gasket, and bolt for a more complete replacement
- Hose material rated for high-temperature oil transfer suitable for heavy use
- Well-documented compatibility with GM trucks based on user reports
- Installation is often difficult and time consuming due to restricted access under mounts and tight chassis locations
Verdict: Choose this ACDelco GM Genuine Parts hose kit when you want a factory-spec replacement that restores oil cooling performance and durability.
3. Psrorkeu Transmission Oil Cooler Line for GMC Sierra 1500 (2007–2014)
| Fitment | GMC Sierra 1500 2007-2014 |
|---|---|
| Material | Alloy Steel with zinc plating |
| Operating temperature range | -40 to 350 degrees Fahrenheit |
| Includes | Brackets, grommets, heat shields, bushings, protective sleeves |
This cooler line is a budget-focused replacement for GMC Sierra 1500 trucks from 2007 through 2014 that restores the transmission oil cooling circuit. It ships as a pre-bent, direct bolt-on tube with brackets, grommets, heat shields, bushings, and protective sleeves so you can swap it in without custom bending or major modifications. The zinc electroplated alloy steel tubing resists corrosion and the part is pressure tested to meet the manufacturer claims for leak-free operation and temperature durability down to -40 and up to 350 degrees Fahrenheit. In real-world use it serves to stop fluid leaks, protect the transmission from overheating, and simplify a DIY repair with factory-style fittings. Expect a no-frills, cost-conscious replacement that covers wearable mounting hardware but may not match premium-brand longevity or include extended fit verification beyond the listed model years. Installation on trucks with prior modifications or heavy corrosion may require extra prep or replacement of adjacent fittings.
Best for: Budget-conscious Sierra owners who need a quick, inexpensive transmission cooler line replacement and prefer a DIY, direct-fit repair to stop leaks and restore cooling function.
Less Ideal for: Owners seeking an extended-lifespan professional-grade upgrade or those with extensively modified cooling or transmission plumbing should consider higher-end alternatives or a shop-fitted solution.
- Direct bolt-on design with pre-bent tubing and included brackets and fittings for straightforward installation
- Zinc-plated alloy steel construction offers improved corrosion resistance compared with bare steel
- Includes protective sleeves, heat shields, and bushings to restore wearable parts and reduce abrasion
- Pressure-tested and rated for a wide temperature range to handle transmission operating conditions
- Aftermarket budget construction may not match long-term durability of higher-end or OEM-brand lines
Verdict: A practical, wallet-friendly direct-fit cooler line for 2007–2014 Sierra 1500s that restores leak-free cooling with factory-style fittings at a budget price.
4. A-Premium Automatic Transmission Oil Cooler Line Hose Assembly
| Material | Stainless Steel/Metal and Rubber |
|---|---|
| Maximum Pressure | 1500 Pound per Square Inch |
| Compatible Models | GMC Sierra 1500 HD/2500/3500 and Sierra 2500/3500 1999-2007 (listed years) |
| Manufacturer Part Number | APOCL330 |
This A-Premium transmission oil cooler line replaces the factory cooler hose on compatible GMC Sierra models and connects the transmission to the external cooler to help maintain transmission operating temperature. It is constructed of metal and rubber with corrosion-resistant elements intended to resist leaks and withstand typical under-hood conditions. Typical use is direct replacement during a transmission service or when an original line is leaking or damaged; installation follows factory routing and uses the same reference numbers for fit check. Practical benefits include a ready-fit aftermarket option with sturdy construction and a claimed pressure rating suitable for transmission fluid circulation. Limitations to consider are that it is a direct-fit part for specific Sierra model years and engine configurations only so compatibility must be confirmed, and aftermarket materials and fittings can vary from factory parts which may affect long-term durability in heavy-duty towing scenarios.
Best for: Reliability-focused buyers who prioritize restoring factory functionality on a GMC Sierra and prefer a ready-fit replacement that gets the cooler system back to service quickly.
Less Ideal for: Drivers planning heavy towing, extreme off-road use, or those who prefer OEM-sourced components for long-term durability should consider higher-spec or factory-sourced options instead.
- Designed to match factory routing for direct replacement on listed GMC Sierra models
- Metal and rubber construction aimed at corrosion resistance and leak prevention
- Reference numbers provided to simplify compatibility checks and parts matching
- Fitment is limited to specific model years and engine configurations so it is not universal
- Aftermarket materials and fittings may not match factory longevity under heavy towing or extreme duty
Verdict: A practical, reliability-minded direct-replacement transmission cooler line for compatible GMC Sierra models, but confirm exact fitment and consider OEM options for heavy-duty use.
5. 6AN 70" Stainless Steel Braided Transmission Cooler Hose Kit
| Material | Stainless Steel/PTFE |
|---|---|
| Size | 70inch |
| Nominal Wall Thickness | 0.0375 inches |
| Outside Diameter | 0.38 Inches |
This kit supplies two 70-inch stainless steel braided PTFE cooler lines with AN6 fittings and assorted 90-degree adapters to connect a transmission to an external cooler. It is typically used when replacing rotted factory hard lines or adding an after-market cooler for towing and heavy use, and the stainless braid plus PTFE core aims to resist corrosion while remaining flexible for routing. The included swivel fittings and 90-degree elbows make it easier to match factory exit points, and many buyers report the lengths and bends work well for common GM transmissions. Practical benefits are improved transmission cooling capacity and a tidy, flexible hose route compared with rigid lines. Expect to need additional vehicle-specific fittings on some manual or newer transmissions because the kit is universal rather than vehicle-specific, and quality control has mixed reports so inspect connections and threads before installation. If you want a direct, plug-and-play factory-style replacement for a Sierra, confirm the fittings match your transmission and be prepared to source a couple of small adaptor fittings in rare cases.
Best for: Risk-averse mainstream buyers who prioritize durability and preventative maintenance and want to add or replace transmission cooler lines to protect against heat-related transmission failure.
Less Ideal for: Buyers seeking an exact factory-fit, vehicle-specific plug-and-play kit or those unwilling to source a small number of adapter fittings if the AN6 interfaces do not match their Sierra's connections.
- Stainless steel braided PTFE construction for corrosion resistance and flexibility
- Includes 70" length lines and multiple 90-degree AN6 fittings for common routing needs
- Swivel fittings simplify alignment and reduce strain at attachment points
- Universal AN6 fittings cover a wide range of GM transmission applications
- Universal kit may require additional adapter fittings for some transmissions or factory coolers
- Variable quality control reported by some buyers, so parts may need inspection or minor thread cleanup
Verdict: A durable stainless steel braided AN6 cooler line kit that gives a practical, flexible upgrade for transmission cooling when you confirm or adapt fittings for your Sierra.
Choosing the Right GMC Sierra Oil Cooler Lines: Key Factors to Consider
Material and Reinforcement
The base material and internal reinforcement determine how well the line resists heat, oil exposure, and pressure cycles. Rubber alone can degrade from hot oil and road contaminants, while braided stainless or multi-layer synthetic hoses offer better longevity and resistance to swelling.
Reinforcement affects kink resistance and burst strength, which matter when routing lines through tight engine bays. Choosing a construction suited to continuous engine temperatures and occasional pressure spikes reduces the chance of premature failure and leaks.
Fitting Type and Compatibility
Correct fittings are essential for leak-free connections to the engine block and cooler. Look for fittings that match the factory thread type, flare style, or quick-connect used on your GMC Sierra to avoid makeshift adapters that introduce additional leak points.
Compatibility also includes the orientation and length of fittings so the line sits without stress at connection points. Properly matched fittings reduce the need for excessive bending and ensure a secure seal under thermal cycling.
Corrosion and Abrasion Resistance
Lines and fittings exposed to road salt, moisture, and debris must resist corrosion and physical wear. Stainless steel braid, protective sleeving, and corrosion-resistant metal fittings help maintain integrity in harsh environments.
Consider also protective routing and clips to prevent chafing against sharp edges. Abrasion damage often leads to slow leaks, so materials and installation strategies that guard against rubbing extend service life.
Complete Kit Vs Individual Lines
Deciding between a full hose kit and individual replacement lines depends on how many components show wear. Kits that include both feed and return lines, plus mounting hardware, simplify installation and ensure matched materials and fittings.
Individual lines may be suitable for targeted repairs, but mixing different materials or manufacturers can create uneven longevity and fit issues. A complete kit often reduces installation time and the risk of compatibility problems.
Ease of Installation and Instructions
Clear installation instructions and included hardware reduce the chance of improper assembly. Lines designed as direct-fit replacements that follow factory routing make it easier to install without special tools or permanent modifications.
Consider access requirements and whether the vehicle needs partial disassembly to reach connections. Options that minimize required removal of other components save time and lower the chance of installation errors that could cause leaks.
Warranty and Manufacturer Support
A solid warranty and accessible support indicate confidence in product durability and assist if a fitment issue arises. Warranty terms that cover leaks or premature failures provide added reassurance for a critical engine system component.
Manufacturer support also matters for clarifying fitment questions and obtaining replacement components if a fitting or clip is missing. Good documentation and customer service reduce downtime if problems appear after installation.
How We Chose the Best GMC Sierra Oil Cooler Lines
We prioritized products that address the most common failure modes for GMC Sierra oil cooler lines: material degradation, connector integrity, and routing that avoids abrasion. Selection criteria included construction material and reinforcement, OEM-equivalent or direct-fit connectors, corrosion-resistant fittings, and manufacturer guidance on compatibility with the GMC Sierra engine and model years. We also considered the availability of complete kits that include both feed and return lines and any necessary mounting hardware, plus clarity of installation instructions. Excluded from consideration were generic or universal hoses without specific GMC Sierra fitment data, products that lack corrosion-resistant fittings, and options with unclear material specifications. The final list favors parts that minimize leak risk, ease installation, and offer long-term durability under typical operating conditions.
Our full evaluation process is outlined in our review methodology.
FAQ
How do I know if my GMC Sierra oil cooler lines are leaking?
Common signs include visible oil drips beneath the vehicle, low oil levels without external engine leaks, and greasy buildup around the cooler line connections. You may also notice oil contamination on nearby components or a strong oil odor. Inspect lines and fittings visually, and check the mounting points for wetness after driving.
Can I replace only one cooler line or should I replace both feed and return lines?
Replacing a single line can be acceptable if only one is damaged, but lines on the same vehicle often have similar age and wear. Installing both feed and return lines together ensures matched materials and fittings, reduces future labor if the other line fails, and can be a more reliable long-term solution.
What tools or preparations are typically needed for cooler line install on a GMC Sierra?
You will usually need basic hand tools, appropriate wrenches for the fittings, and possibly line-specific disconnect tools depending on the connector type. Have oil catch pans and clean rags ready to control spills, and follow vehicle-specific routing to avoid kinks. Work on a cool engine and support the vehicle safely if access from underneath is required.
Are aftermarket hose kits as reliable as OEM-style lines?
Quality aftermarket hose kits can match or exceed OEM performance when they use durable materials and correct fittings. Reliability depends on construction, corrosion resistance, and proper fitment. Look for kits that specify direct-fit compatibility with the GMC Sierra and include detailed installation guidance.
What are common causes of oil cooler line failure?
Failures often stem from material degradation due to heat and oil exposure, physical abrasion from improper routing, corrosion of metal fittings, and stress from incorrect bends or tight mounting. External impacts and road debris can also damage lines. Regular inspection helps catch wear before a full failure.
Conclusion
When choosing GMC Sierra oil cooler lines, prioritize correct fitment and durable construction to minimize leak risk and downtime. Consider kits that include both feed and return lines and corrosion-resistant fittings to ensure matched performance. Balance ease of installation against long-term durability. Proper routing, secure mounting, and attention to material quality will reduce the likelihood of future repairs and support reliable oil cooling for the engine.
Explore More:
- Check out all GMC Sierra parts & accessories
- Explore Oil Cooler Lines Maintenance & Repair Guides
- Explore Cooling System
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