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If you drive a Toyota Highlander, well-functioning oil cooler lines keep engine oil at a safe temperature and prevent leaks that can lead to damage. Picking the right oil cooler lines matters because incorrect fitment or poor materials can cause fluid loss, reduced oil pressure, and premature component wear. This guide highlights the top shortlisted oil cooler lines for the Toyota Highlander based on durability, fitment, and ease of installation. Read on to understand the evaluation criteria and which options made the cut.
Looking for other parts? See all Toyota Highlander parts & accessories.
Top Picks at a Glance
| Best overall The best all-around choice for most situations | NOVAPARTS Engine Oil Cooler Line Hose Assembly with Gaskets |  |
| Best Quality Built to a higher standard if you want something more solid | Toyota Genuine Engine Oil Cooler Pipe (15767-31020) |  |
| Best Value The sweet spot between price and what you get | APDTY Engine Oil Cooler Lower Pipe Assembly with Gaskets |  |
| Best Budget The cheapest option that still gets the job done reliably | Taruimoo Oil Cooler Line for Toyota 3.5L Engines (replace 15772-31030) |  |
| Highest Rated A top-rated pick with lots of positive feedback | DICMIC Engine Oil Cooler Lower Line with Gaskets for Toyota Highlander & Lexus RX |  |
| Most Popular A crowd favorite that many people choose with confidence | Dorman Engine Oil Cooler Hose Assembly for Select Lexus and Toyota Models |  |
| Best Seller A high-volume bestseller chosen again and again | OKAY MOTOR Lower Engine Oil Cooler Pipe with Gaskets for Toyota Highlander/Sienna/Venza and Lexus RX350/RX450h 3.5L V6 |  |
1. NOVAPARTS Engine Oil Cooler Line Hose Assembly with Gaskets
| Fitment | 2007–2016 Lexus RX350/RX450h, 2008–2019 Toyota Highlander, 2007–2019 Toyota Sienna, 2009–2016 Toyota Venza |
|---|---|
| Included parts | 1 oil cooler line + 2 gaskets |
| Manufacturer | Yupin Auto Parts Co.; Ltd. / NOVAPARTS |
This NOVAPARTS oil cooler line replaces the factory metal hose that routes oil to the engine cooler and ships with two gaskets for sealing at the flanges. It is intended as a direct replacement for 2007–2016 Lexus RX350/RX450h and 2008–2019 Toyota Highlander, Sienna, and 2009–2016 Venza applications and is typically used during coolant/oil system repairs or when a failing rubber hose is replaced with a durable metal line. The part comes ready to install and reviewers report good fitment on many Highlander and RX models when flange surfaces are cleaned and basic hand tools are used. Practical benefits include restoring proper oil cooling lines to prevent leaks and avoiding a shop visit if you are comfortable with intermediate driveway repairs. Some users noted occasional fitment differences versus the original part and tight access to certain bolts, so patience, the right sockets, and minor trimming or surface prep may be required to achieve a leak-free seal.
Best for: Balanced buyers who want a reliable, factory-replacement style repair they can install themselves or have a trusted technician fit, prioritizing long-term durability and correct routing.
Less Ideal for: People who prefer an exact OEM-sourced part or who cannot access tight engine bay fasteners should consider dealer parts or professional installation instead.
- Direct-fit replacement for the listed Toyota and Lexus 3.5L models so it can restore factory routing.
- Includes two gaskets so you get sealing hardware needed for installation.
- Metal line construction offers a long-term fix versus deteriorated rubber hoses.
- Multiple customer reports confirm successful installs on Highlander and RX models.
- Some units show slight shape differences from the original part that can make accessing rear flange bolts difficult on certain model years.
Verdict: A cost-effective, metal direct-replacement oil cooler line for Toyota Highlander owners seeking a durable repair, but check fit and bolt access before installation.
2. Toyota Genuine Engine Oil Cooler Pipe (15767-31020)
| Manufacturer | Toyota |
|---|---|
| Model | Oil Cooler Pipe |
| Exterior | Machined |
| Item model number | 15767-31020 |
This is a factory-quality replacement oil cooler pipe that restores the metal oil feed between the engine and cooler assembly. It is typically used when original rubber or failing cooler hoses crack and leak, and it installs in place of the OEM pipe on compatible Toyota vehicles. The part is machined, matches the factory fitment and mounting points, and buyers report straightforward bolting with no initial leaks when gaskets are added separately. Because it is a genuine Toyota part it eliminates the common rubber-hose failure mode and gives a durable metal connection that resists heat and oil exposure. Expect some installation effort in tight engine bays and the need to purchase the two gaskets and a reverse Torx or hex socket for a few fasteners. Packaging may be minimal and gaskets are not included, so plan for those additional parts and a careful install to avoid pinched fittings.
Best for: Performance-oriented buyers who prioritize durable, factory-quality replacements to prevent oil hose failures and maintain reliable engine cooling under demanding driving.
Less Ideal for: Budget-focused owners who prefer a lower-cost aftermarket hose assembly with included seals or buyers unwilling to perform a moderately involved repair and source extra gaskets and tools.
- Genuine Toyota part with factory-spec fit and mounting points
- Machined metal construction reduces risk of cracking compared with rubber lines
- Matches OEM flanges for a tight, leak-resistant connection when gaskets are used
- Durable solution that prevents repeat failures common to original rubber hoses
- Does not include gaskets or sealing hardware so additional parts must be purchased separately
- Installation can be awkward in tight engine bays and requires specialty sockets for some fasteners
Verdict: A factory Toyota metal oil cooler pipe is the long-term fix for leaking rubber cooler lines but requires buying gaskets and a bit more installation effort.
3. APDTY Engine Oil Cooler Lower Pipe Assembly with Gaskets
| Compatible Engine | 3.5L V6 (3456cc) |
|---|---|
| Position | Front |
This APDTY lower oil cooler pipe assembly replaces the factory supply and return line that routes oil between the engine and oil cooler on 3.5L V6 Toyota Highlander models. It is a one-piece supply/return assembly supplied with gaskets so you can remove the old leaking hose-and-clip setup and install a single corrosion-resistant line. Typical use is as a direct replacement during an oil leak repair or scheduled cooling system service. The practical benefits include a solid-piece design that eliminates multiple hose joints that commonly fail, included gaskets to simplify sealing, and corrosion-resistant construction aimed at longer life than deteriorated rubber lines. Installation can be moderately involved because access under the engine may be tight and some users report the aftermarket design needs careful alignment during fitment. This part is a focused value alternative to dealer replacement and works well when installed properly, but expect to spend time on proper sealing and routing during the job.
Best for: Practical optimizers looking to repair a leaking oil cooler line on a Highlander themselves or get a cost-effective, longer-lasting replacement without paying dealer labor premiums.
Less Ideal for: Drivers who prefer dealer parts and fitment certainty or who want a plug-and-play solution with professional installation included should consider alternatives.
- One-piece supply and return design reduces potential leak points compared with multiple rubber hoses.
- Includes gaskets so you have the sealing components needed for reassembly.
- Made from corrosion-resistant materials to improve longevity in road conditions.
- Direct-fit replacement for the Highlander 3.5L V6 according to compatibility listing.
- Installation may be awkward and requires careful alignment in tight engine access areas.
- Aftermarket fit and finish can differ from factory parts, requiring patience during installation.
Verdict: A budget-friendly, corrosion-resistant replacement that fixes common oil cooler line leaks on 3.5L Highlanders if you are comfortable with a moderately involved DIY installation.
4. Taruimoo Oil Cooler Line for Toyota 3.5L Engines (replace 15772-31030)
| Compatible engines | Toyota 3.5L Engine |
|---|---|
| Replaces part numbers | 15772-31030, 90430-16016, 90430-16017 |
| Unit count | 1.0 Count |
| Manufacturer | Taruimoo |
This Taruimoo oil cooler line is a direct-replacement aftermarket hose meant for Toyota 3.5L engines found in Highlander, Sienna, Camry, Avalon and Venza models. It is sold as a single preformed line that replaces part numbers such as 15772-31030 and the 90430-16016/16017 family. The seller highlights corrosion-resistant construction and improved heat-exchange performance, and the part is marketed for straightforward bolt-on installation without specialty tools. For a budget-focused buyer this offers a low-cost way to restore oil cooling plumbing after a leak or damage, and the included fitment notes make it easy to check compatibility. Limits to expect are modest build quality compared with higher-end OEM or premium aftermarket lines and minimal manufacturer support beyond initial contact; buyers should inspect fittings and seals during installation and be prepared to replace clamps or O-rings if needed. Given mixed user feedback, confirm exact fit and test for leaks after installation.
Best for: Budget-conscious owners seeking an inexpensive, functional replacement oil cooler line to repair a leaking or damaged plumbing without buying a higher-priced aftermarket or factory part.
Less Ideal for: Buyers who prioritize long-term durability or professional restorations should consider higher-grade or factory-quality lines and professional-supported brands instead.
- Fits Toyota 3.5L applications listed (Highlander, Sienna, Camry, Avalon, Venza) for straightforward replacement
- Marketed corrosion-resistant construction intended to improve heat exchange and durability
- Sold as a single complete replacement line for easy, no-frills installation
- Aftermarket build quality may not match factory parts for long-term durability
- Limited documented warranty or technical support beyond seller contact
Verdict: A low-cost, direct-replacement oil cooler line for Toyota 3.5L engines that gets the job done for budget repairs.
5. DICMIC Engine Oil Cooler Lower Line with Gaskets for Toyota Highlander & Lexus RX
| Compatible models | 2007-2016 Lexus RX350, 2010-2016 Lexus RX450h, 2008-2019 Toyota Highlander, 2007-2019 Toyota Sienna, 2009-2016 Toyota Venza |
|---|---|
| Package contents | 1x oil cooler line, 2x gasket |
| Manufacturer | DICMIC |
| Manufacturer part number | DICMIC-D261 |
| OEM part numbers | 0400429131, 1576731010, 1576731020, 625-022 |
This DICMIC lower oil cooler line assembly replaces the factory supply and return pipes for select Toyota Highlander, Lexus RX, Sienna, and Venza model years. It is sold as a complete metal line with two gaskets and is intended for use when the original rubber/metal lines corrode or leak. Installation is typical for this class of part: remove the underside cover, unbolt the old line, clean the mating surfaces, fit the supplied gaskets, and torque the hardware to spec. Customers report a snug, OEM-like fit and that the all-metal construction can feel more robust than the original mixed rubber/metal design. Benefits include straightforward, single-part replacement and included gaskets that simplify the job. Limitations are that the package contains no instructions and tight engine bay access can make removal and reinstallation fiddly; some buyers needed minor finishing work on brazed joints or used gasket sealant to ensure a leak-free seal. For a reliability-minded buyer looking to stop oil leaks and restore proper oil cooling, this provides a practical aftermarket alternative to dealer parts.
Best for: Reliability-focused owners who prioritize fixing oil leaks with a straightforward, durable aftermarket replacement rather than dealer sourcing and who are comfortable following vehicle-specific repair guides.
Less Ideal for: Buyers who want plug-and-play professional installation without any tinkering or those who prefer parts that include step-by-step printed instructions and guaranteed factory packaging.
- Direct-fit replacement for affected Toyota and Lexus model years listed by the manufacturer
- Includes two gaskets so you get the main sealing parts needed for installation
- All-metal line design improves durability compared with mixed rubber/metal OEM pieces
- Multiple customer reports of good fit and restored oil cooling with no leaks after installation
- No printed installation instructions included, so DIYers may need to reference guides or videos
- Tight fit in the engine bay can make installation awkward and may require removal of studs or covers
Verdict: A practical, all-metal aftermarket replacement for leaking lower oil cooler lines that fits the specified Highlander and Lexus models and restores oil cooling without expensive dealer parts.
6. Dorman Engine Oil Cooler Hose Assembly for Select Lexus and Toyota Models
| Material Type | Metal |
|---|---|
| Item Type Name | Engine Oil Cooler Line |
| Unit Count | 1.0 Count |
| Included Components | Oil Cooler Line |
This Dorman engine oil cooler hose assembly replaces the original hose to restore proper oil circulation between the engine and oil cooler on compatible Lexus and Toyota models. It is a metal-line assembly intended as a direct-fit replacement, delivered with the metal gasket and designed to resist corrosion compared with older rubber lines. Typical use is a scheduled or failure-driven replacement on models such as the Highlander, RX350/RX450h, Sienna, and Venza of the listed years. Installers report it fits like the factory part and can eliminate recurring rubber-hose failures, though installation can be fiddly and often requires an E8 Torx and basic hand tools; removing one mounting stud simplifies access. Quality control appears mostly reliable but occasional units have had welding/fitment issues or missing hardware, so verify all pieces on receipt. For convenience-focused buyers this part saves a trip to the dealer while providing a durable, factory-style repair when correct fitment is confirmed.
Best for: Convenience-driven buyers who want a reliable, ready-made replacement that avoids dealer service and gets the vehicle back on the road quickly with a durable fix.
Less Ideal for: If you prefer guaranteed factory-sourced parts or need a perfect plug-and-play experience without any risk of missing pieces, consider sourcing a factory replacement from the dealer instead.
- Direct-replacement design intended to match factory fit and function
- Metal construction offers improved corrosion resistance over rubber lines
- Ships with metal gasket for proper sealing at the mating surface
- Multiple user reports confirm good fit and leak-free operation after installation
- Some buyers reported occasional welding or fitment defects requiring return or replacement
- May arrive without every small hardware piece so you should check contents before starting the job
Verdict: A durable, factory-style metal oil cooler hose assembly that provides a convenient, long-lasting replacement for select Toyota and Lexus models.
7. OKAY MOTOR Lower Engine Oil Cooler Pipe with Gaskets for Toyota Highlander/Sienna/Venza and Lexus RX350/RX450h 3.5L V6
| Fitment | 2007-2016 Toyota Highlander/Sienna; 2011-2015 Venza; 2007-2015 Lexus RX350; 2010-2015 RX450h |
|---|---|
| Includes | 1 oil cooler line and 2 gaskets |
| Manufacturer | Okay Motor Products |
This OKAY MOTOR kit replaces the lower oil cooler pipe and includes the two metal gaskets needed for installation on compatible 3.5L V6 Toyotas and Lexus RX models. It is intended for routine repair when the factory rubber or corroded cooler lines fail or begin leaking; install requires basic mechanical skill and access to sockets, extensions, and possibly a universal joint for tight studs. The part is aftermarket but built from stamped metal and shipped with gaskets so you can restore a sealed oil-cooler circuit without buying multiple pieces. Buyers report straightforward fitment on the specified Highlander, Sienna, Venza and RX applications, though packing of small gasket parts can be loose and the finish may not match OE chrome. Expect to spend time on removal and reassembly in cramped engine bays, and verify the OE part number before ordering to ensure exact compatibility with your vehicle year and engine variant.
Best for: Risk-averse mainstream buyers who prioritize restoring reliable, factory-quality engine cooling components on a maintained 3.5L V6 Toyota or Lexus and prefer a straightforward replacement to avoid oil leaks.
Less Ideal for: Shoppers seeking a cosmetically exact OEM finish or plug-and-play swap without any mechanical work should consider a dealer-sourced part or professional installation instead.
- Includes both the lower oil cooler pipe and the required cooler gaskets for a single repair job
- Designed to fit the specified 3.5L V6 Highlander, Sienna, Venza and Lexus RX model years listed
- Made from metal construction intended to replace aging rubber lines and reduce leak risk
- Saves the time and cost of sourcing separate gaskets and pipe from multiple suppliers
- Installation can be difficult in tight engine spaces and may require specialty sockets, extensions, or universal joints
- Finish and packaging quality can be inconsistent compared with factory parts
Verdict: A practical aftermarket replacement kit that supplies the lower oil cooler pipe and gaskets needed to stop leaks and restore the cooling circuit on compatible 3.5L V6 Highlander and Lexus RX models.
Choosing the Right Toyota Highlander Oil Cooler Lines: Key Factors to Consider
Material and Corrosion Resistance
Material choice determines how well lines resist heat, oil exposure, and road contaminants. Metal tubing and PTFE-reinforced hoses generally withstand higher temperatures and are less prone to permeation or swelling than basic rubber lines. Corrosion-resistant coatings or stainless steel fittings reduce the chance of rust-related failures where lines attach to the engine or cooler.
Longer-lasting materials reduce maintenance intervals and lower the likelihood of sudden leaks. When assessing options, check for explicit material specifications and any protective finishes that extend service life.
Fitment and Compatibility
Correct fitment ensures that lines align with feed and return ports, mounting brackets, and cooler connections without strain. Lines designed specifically for the Toyota Highlander simplify installation and reduce the need for adapters or modifications. Mismatched lengths or incorrect fittings can place stress on connections and lead to premature failure.
Verify vehicle-year-specific fitment notes and whether the kit includes vehicle-compatible fittings and brackets to avoid compatibility issues during installation.
Fitting Type and Seal Quality
The design of end fittings and sealing surfaces is crucial to preventing leaks. Flared fittings, O-ring seals, or banjo-style ends each have different sealing behaviors and torque requirements. High-quality fittings with precise machining or molded seals typically offer more reliable leak prevention than poorly finished components.
Consider whether the kit includes replacement crush washers, O-rings, or properly sized clamps, since those small parts often determine whether a connection remains tight over time.
Hose/Internal Diameter and Flow Capacity
Internal diameter affects how oil flows between the engine and cooler. Lines that are too restrictive can lower oil flow and impact cooling efficiency or oil pressure. Conversely, adequately sized passages preserve intended flow characteristics and ensure the cooler can do its job without creating backpressure.
Look for specifications on internal diameter and stated flow capacity when available. Matching or exceeding the original equipment flow dimensions is usually the safest approach.
Ease of Installation and Serviceability
Easy-to-install lines reduce labor time and the chance of installation errors that cause leaks. Features that aid installation include pre-formed bends that match factory routing, included mounting brackets, and clear instructions. Removable fittings or modular components can make future maintenance simpler.
Also consider whether the design allows for visual inspection and accessible hose routing to spot wear early. Kits that provide commonly needed hardware and clear torque specs help ensure a reliable assembly.
Durability Under Heat and Pressure
Oil cooler lines must tolerate continuous exposure to hot oil and the engine bay environment. Heat-resistant materials and reinforcement layers help hoses resist softening, swelling, or burst risk under pressure. Metal lines should have durable welds and bends that resist fatigue.
Assess stated temperature and pressure ratings when available, and favor constructions with documented resistance to the typical conditions in the engine compartment.
How We Chose the Best Toyota Highlander Oil Cooler Lines
We focused on attributes that matter most for Toyota Highlander oil cooler lines and applied a consistent editorial filter to narrow the field. Primary criteria included material construction and corrosion resistance, since metal or reinforced hose materials affect longevity under heat and pressure. We prioritized fitment accuracy and OEM-compatible fittings to ensure correct connection to the engine's feed and return ports. Ease of installation and clear instructions were weighed because simpler installs reduce the chance of installation-related leaks. Flow capacity and internal diameter were considered to maintain oil pressure and cooling performance. Finally, long-term sealing and clamp/fitting quality were assessed to minimize leak risk. We excluded items that lacked clear fitment data for the Toyota Highlander, products with no documented materials or warranty details, and those without user-accessible installation guidance. The resulting shortlist reflects lines that met the technical durability, compatibility, and serviceability standards relevant to this vehicle category.
Our full evaluation process is outlined in our review methodology.
FAQ
How do I know if my Highlander's oil cooler lines are failing?
Common signs include visible oil stains under the vehicle, a drop in oil pressure, or an oil smell in the engine bay. You might also notice overheating if oil cooling is compromised. Inspect lines and fittings for wetness, cracks, bulges, or corroded connectors, and address any leak promptly to avoid engine damage.
Can I replace oil cooler lines myself?
Many owners can perform a line replacement with basic mechanical skills and the right tools, especially if the kit includes vehicle-specific fittings and instructions. Work in a clean area, relieve system pressure, and follow torque specs for fittings. If routing is complex or access is limited, professional installation can reduce the risk of leaks.
Should I choose metal lines or reinforced hoses?
Both types have tradeoffs. Metal lines resist abrasion and heat but can be more prone to denting or fatigue at bends. Reinforced hoses are flexible and better at absorbing vibration but depend on high-quality reinforcement to resist swelling. Consider routing, vibration exposure, and manufacturer-specified recommendations when choosing.
What causes oil cooler line leaks?
Leaks often stem from aged or cracked hose material, corroded or damaged fittings, improperly tightened connections, or chafing where the line rubs against other components. Thermal cycling and road contamination can accelerate wear. Addressing the root cause, such as replacing worn clamps or re-routing to prevent chafing, helps prevent recurrence.
Do replacement kits include seals and fittings?
Kits vary, but reputable assemblies typically include necessary fittings, seals, and hardware to match the vehicle's connections. Always check the kit contents before starting work so you have any required crush washers, O-rings, or brackets on hand. If a kit lacks critical small parts, sourcing proper replacements is important for a reliable seal.
How long should new oil cooler lines last?
Lifespan depends on material quality, driving conditions, and maintenance. High-quality metal or reinforced hoses used in normal conditions often last many years, while lower-grade rubber components may need replacement sooner. Regular inspection for wear and prompt attention to early signs of deterioration extend service life.
Conclusion
Choosing the right oil cooler lines for a Toyota Highlander means balancing durable materials, correct fitment, and reliable sealing. Prioritize options that specify corrosion-resistant materials, vehicle-specific fittings, and clear installation guidance to reduce the risk of leaks and maintain proper oil flow. Keep in mind tradeoffs between flexibility and rigidity, and consider ease of service when evaluating kits. Regular inspection after installation and attention to routing and clamps will help ensure long-term performance.
Explore More:
- Check out all Toyota Highlander parts & accessories
- Explore Oil Cooler Lines Maintenance & Repair Guides
- Explore Cooling System
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