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If you own a Scion tC, choosing the right oil cooler lines matters because they keep oil flowing and engine temperatures under control during spirited driving or towing. Poorly matched or worn lines can lead to leaks, pressure loss, and accelerated engine wear. This guide covers seven shortlisted oil cooler lines selected for compatibility with the Scion tC and focuses on durability, fitment, and leak resistance. Below we explain the selection criteria and key factors to help you pick the best option for your driving needs.
Looking for other parts? See all Scion tC parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | Dorman Transmission Oil Cooler Line Assembly — Stainless Steel (624-548) |  |
| Most Popular A crowd favorite that many people choose with confidence | A-Premium Inlet Transmission Oil Cooler Line Hose Assembly |  |
| Best Quality Built to a higher standard if you want something more solid | A-Premium Inlet and Outlet Engine Oil Cooler Line Hose Assembly |  |
| Best Budget The cheapest option that still gets the job done reliably | NOVAPARTS Engine Oil Cooler Line with Gaskets |  |
| Most Sold A high-volume bestseller chosen again and again | Generic 52" Stainless Steel Braided AN6 Transmission Cooler Line Kit |  |
| Best Value for Money The sweet spot between price and what you get | DICMIC Engine Oil Cooler Lower Hose Pipe Assembly with Gaskets |  |
| Best Overall The best all-around choice for most situations | Generic 6AN 70" Stainless Steel Braided Transmission Cooler Line Kit |  |
1. Dorman Transmission Oil Cooler Line Assembly — Stainless Steel (624-548)
| Material | Stainless Steel |
|---|---|
| Maximum Pressure | 100 Pound per Square Inch |
| Nominal Wall Thickness | 1 millimeters |
| OEM Part Number | 5801498; 45522AG040; 45522AG041 |
This Dorman replacement is a preformed transmission oil cooler line assembly intended to replace corroded factory hard lines and restore the cooling circuit. It arrives with brackets and fittings attached so installers can bolt it in place and reconnect the rubber hoses, and the stainless steel tubing is meant to resist the rust-related leaks that commonly develop in original lines. Typical use is a direct repair where the original hard line has begun to weep or leak; expect to remove the battery and undertray for access and to reuse some factory fasteners. Notable features include stainless steel construction, factory-matching bends and flares, and included mounting brackets. The practical benefits are improved longevity over plated or aluminum lines and a near-direct fit that reduces mock-ups during installation. Limitations are that installation can be fiddly in tight engine bays, some original screws may need to be reused because they are not included, and adjacent components or aged hoses may require replacement to fully stop leaks.
Best for: A reliability-focused buyer who prioritizes long-term repairs and wants a durable, direct-replacement line to avoid recurring corrosion-related leaks.
Less Ideal for: Buyers seeking a plug-and-play swap with all fasteners included or those unwilling to tackle a moderately involved underhood repair should consider professional installation or alternative solutions.
- Stainless steel tubing resists corrosion better than original metal lines
- Preformed bends and flared tube ends for a near-direct replacement fit
- Ships with mounting brackets and fittings already attached to simplify installation
- Matches factory routing so alignment with existing clamps and holes is straightforward
- Does not include the small mounting screws so original fasteners may be needed
- Installation can be time consuming and requires battery/undercarrier removal for access
Verdict If you want a corrosion-resistant, factory-matching replacement to stop recurring cooler-line leaks, this stainless steel assembly is a practical, long-term fix.
2. A-Premium Inlet Transmission Oil Cooler Line Hose Assembly
| Material | Metal |
|---|---|
| Hose Maximum Pressure | 100 PSI |
| Fitment Type | Direct Replacement |
| Manufacturer Part Number | APOCL243 |
This A-Premium inlet transmission oil cooler line is a direct-replacement hose assembly designed to carry transmission fluid between the radiator and transmission. It is typically used when a factory line leaks, corrodes, or is damaged and needs a one-to-one replacement. The metal construction and formed bends in the line let it follow factory routing for a straightforward swap, and the product lists several OEM reference numbers to help confirm fit. Buyers will appreciate the 100 PSI hose rating and the stated direct-replacement fit, which simplify installation for a weekend DIYer or a quick shop job. Expect some fluid loss during removal and minor differences at connector ends on rare units, so keep tools and rags ready. The item includes a one-year unlimited-mileage guarantee from the maker. This part is specific to certain GM vehicles by the manufacturer, so verify compatibility before ordering and be prepared to compare the bends and connection types against the line you are replacing.
Best for: Convenience-driven buyers who prioritize an easy, quick repair with a ready-made factory-style replacement and want to minimize shop time.
Less Ideal for: Shoppers seeking a universal line or a performance upgrade should look elsewhere; this is intended as a direct factory-style replacement rather than a high-performance or custom-routing part.
- Formed metal hose assembly matches factory routing for simpler installation
- Direct-replacement design with multiple OEM reference numbers for cross-checking fit
- Hose rated to 100 PSI, suitable for normal transmission cooling pressures
- Backed by a one-year unlimited-mileage guarantee from the brand
- Fitment is vehicle-specific so incorrect selection can require a return
- Some customers reported minor differences at the transmission connector that may need slight adjustments
- Installation will spill transmission fluid and may require basic tools and precautions
Verdict A practical, factory-style inlet transmission cooler line for straightforward replacements when you need a convenient, ready-to-install option.
3. A-Premium Inlet and Outlet Engine Oil Cooler Line Hose Assembly
| Material | Rubber/Metal |
|---|---|
| Maximum Pressure | 1500 Pound per Square Inch |
| Fitment Type | Direct Replacement |
This A-Premium oil cooler line set is a direct-replacement inlet and outlet assembly intended to carry engine oil from the filter to the radiator. It pairs rubber and metal sections with included seals so you can reinstall factory-style connections; the listing notes a durable, corrosion-resistant construction and a high maximum pressure rating, which suggests it was built to resist leaks and handling under boost or high-temperature service. In practice this type of assembly is used when original cooler lines crack, leak, or fail and you need a like-for-like replacement. Buyers should expect a mostly plug-and-play swap when the part truly matches the vehicle fittings, but reviews indicate some units require patience and slight trimming or tweaking at the radiator end for a tight fit. The package includes gaskets and is sized as a complete length assembly, so you replace both paths at once. If fitment is exact the result is a solid repair that restores oil cooling routing; if the bends are off you may need minor adjustment or professional installation.
Best for: Performance-oriented buyers who prioritize restoring reliable oil cooling with a factory-style replacement and are willing to adjust fitment to ensure secure connections.
Less Ideal for: Buyers seeking a guaranteed bolt-in upgrade for a different vehicle without modification or those who prefer aftermarket braided stainless lines or custom-fitted options.
- Direct-replacement design that restores factory oil routing
- Combination rubber and metal construction for corrosion resistance
- Includes gaskets/seals for a complete install
- High maximum pressure rating for robust service
- Fit and bend geometry can require filing or tweaking at the radiator connection
- May need hand-fitting or minor modification to achieve a leak-free seal
Verdict A solid factory-style replacement that restores oil cooler routing and pressure tolerance when fitment is correct, but may require careful fitting at the radiator end.
4. NOVAPARTS Engine Oil Cooler Line with Gaskets
| Brand | NOVAPARTS |
|---|---|
| Model | Oil Cooler Line w/Gaskets |
| Manufacturer | Yupin Auto Parts Co.; Ltd. |
| OEM Part Number | 15767-31020, 15785-31010, 11496-31010 |
This NOVAPARTS oil cooler line is a direct-replacement style pipe sold with two mating gaskets to restore the engine oil cooler circuit. It is typically used to replace aged rubber hoses or a corroded metal line that have started to leak or burst, and the included gaskets simplify reinstall. The pipe is built to match factory mounting flanges and many buyers report it fits without bending or modification when the part number matches. Practical benefits include a metal replacement that resists swelling and collapse versus soft hoses and a straightforward install for someone with basic hand tools. Limitations to be aware of are occasional fitment variance between aftermarket and factory bends that can make access to fasteners tight on some model years, and a small number of buyers found minor finishing issues on flange faces that required light cleaning for a leak-free seal. This part is best when you need an affordable, ready-to-install metal cooler line and are prepared to check flange mating surfaces and follow torque and gasket-sealing practice during installation.
Best for: Cost-conscious DIYers who prioritize a low-cost, functional replacement part to stop oil cooler leaks and are comfortable checking fit and finishing surfaces during install.
Less Ideal for: Shoppers seeking a guaranteed exact factory-forged match or those who prefer paying for dealer-sourced factory-quality replacements.
- Includes two gaskets to simplify reassembly and help ensure a seal
- Metal pipe replacement is more durable than rubber hoses and resists swelling
- Many buyers report good fit when part number matches the vehicle
- Affordable aftermarket option for restoring oil cooler plumbing
- Aftermarket bend geometry can differ from factory and block access to some fasteners on certain model years
- Some flange faces may need light cleaning or finishing to achieve a leak-free seal
Verdict A budget-friendly metal oil cooler line with gaskets that fixes leaks reliably when the part number matches, but check bend geometry and flange finish before final install.
5. Generic 52" Stainless Steel Braided AN6 Transmission Cooler Line Kit
| Material | Stainless Steel and PTFE |
|---|---|
| Item Length | 52 Inches |
| Fitting Standard | AN6 |
This kit supplies stainless steel braided PTFE lines and a selection of AN fittings intended to route transmission fluid to an external cooler. It is typically used when adding an aftermarket transmission cooler or replacing deteriorated rubber lines on an older vehicle. The braided hose and PTFE inner liner resist heat and abrasion better than factory rubber, and the included 90 degree fittings and straight lengths make it straightforward to run lines from the transmission to a remote cooler. In practice the kit speeds installation for a convenience-driven buyer because it bundles long lengths and multiple adapters instead of sourcing parts separately. Expect good pressure handling and corrosion resistance, but be prepared to verify fitment: the kit uses AN6 fittings so additional adapters or changes may be required to mate to Scion tC factory ports or a specific cooler. Quality control appears mixed across reports, so inspect fittings and connections and carry thread sealant or tape and any small adapters you might need before installation.
Best for: Practical, convenience-focused owners who want a ready-made kit to add or replace transmission cooler lines quickly without sourcing multiple individual parts.
Less Ideal for: People who prefer a vehicle-specific factory-quality replacement or complete plug-and-play kit tailored to a Scion tC rather than a universal AN6 setup.
- Stainless steel braid with PTFE liner for improved abrasion and heat resistance over stock rubber lines.
- Includes multiple lengths and 90 degree AN fittings to simplify routing to an aftermarket cooler.
- Long 52-inch hose lengths reduce the need to join sections for many installations.
- Works with AN6 adapter fittings common in aftermarket transmission cooling setups.
- Uses AN6 thread standard which may require additional adapters to mate to Scion tC factory fittings or some coolers.
- Reported inconsistency in quality control and occasional damaged or incorrectly sized parts in some units.
- Some installations required buying extra fittings not included in the kit for a complete, leak-free hookup.
Verdict A convenient, long braided AN6 line kit that speeds aftermarket cooler installations but may need adapters and careful inspection for Scion tC fitment.
6. DICMIC Engine Oil Cooler Lower Hose Pipe Assembly with Gaskets
| Manufacturer | DICMIC |
|---|---|
| Manufacturer Part Number | DICMIC-D261 |
| OEM Part Number | 0400429131, 1576731010, 1576731020, 625-022 |
| Position | Lower supply & return |
This lower oil cooler line assembly replaces the factory lower supply and return lines and ships with two metal gaskets for sealing. It is designed to be fitted in the vehicle where the original lines run between the engine and the oil cooler and is intended for owners comfortable with under‑engine access and basic hand tools. Notable features include full metal tubing construction and included gaskets, which reviewers report install tightly and resist the rot that affects older rubber/metal assemblies. In practice the part reduces the chance of hose failure and oil leaks compared with deteriorated original lines, and several users found the fit very close to factory dimensions. Installation can be fiddly because of limited space around studs and fasteners and the part arrives without instructions, so expect to reference a repair guide or video; some minor finishing (sanding or cleaning mating surfaces) may be needed to ensure a perfect seal. The part offers a low-cost option that restores oil flow to the cooler without paying dealer prices but it may require modest mechanical skill and patience during installation.
Best for: Practical optimizers seeking a reliable, budget-friendly replacement part to extend vehicle life without paying dealer markup and willing to do DIY or moderate garage work.
Less Ideal for: Buyers who want a plug‑and‑play, garage‑free solution or who lack basic mechanical skills and tools should consider having a shop perform the replacement or choose a part with professional installation.
- Full metal tube assembly that avoids OEM rubber-to-metal weak points
- Includes two metal gaskets so you have the sealing pieces needed for installation
- Reported to fit factory mounting points closely for a straightforward replacement
- Lower cost than dealer or OEM options while restoring oil cooler connections
- No installation instructions included so novice installers must find guidance elsewhere
- Tight access and long studs may make removal and refit awkward in cramped engine bays
Verdict A cost-effective all-metal replacement line that restores oil cooler function at a fraction of dealer cost but demands careful installation.
7. Generic 6AN 70" Stainless Steel Braided Transmission Cooler Line Kit
| Material | Stainless Steel/PTFE |
|---|---|
| AN Size | 6AN |
| Length | 70 Inches |
This kit supplies two 70-inch stainless steel braided PTFE transmission lines and a selection of AN fittings intended to route fluid from a transmission to an auxiliary cooler or replace deteriorated hard lines. It is commonly used when adding an aftermarket cooler for towing or when replacing leaking factory soft lines. The braided construction and PTFE inner hose give better abrasion and heat resistance than rubber lines and the included 90 degree fittings simplify routing in tight spaces. In practice the kit improves cooling capability when paired with a properly sized cooler, and the stainless braid holds pressure well for high-demand use. Limitations are its universal fit approach. Some vehicles require additional adapters or different thread types to match factory ports, and a few buyers report inconsistent quality control and occasional leaks from factory connections out of the box. Expect to measure fittings and possibly source a small number of adapter fittings for a clean, leak-free install.
Best for: Risk-averse mainstream buyers looking to add reliable aftermarket transmission cooling to a daily driver or towing vehicle who prioritize durability and proven materials over a custom-made hose solution.
Less Ideal for: Buyers who want a vehicle-specific plug-and-play kit for the Scion tC without measuring ports or sourcing adapters should consider a model-specific hose assembly instead.
- Stainless steel braid with PTFE inner hose for improved abrasion and heat resistance compared with rubber lines
- Includes 90 degree AN fittings to simplify tight routing and installation
- Long 70-inch length suits routing to remote coolers or for larger vehicles
- Holds high hydraulic pressure when installed correctly, suitable for towing or heavy use scenarios
- Universal AN sizing may require purchasing additional adapters to match some factory transmission or cooler ports
- Quality control appears variable with reports of incorrect lengths or pre-used items in rare cases
Verdict A durable, long universal braided cooler line kit that improves cooling but may need extra adapters or fitment checks for a Scion tC.
Choosing the Right Scion tC Oil Cooler Lines: Key Factors to Consider
Material and Construction
Material choice determines how well lines resist heat, oil exposure, and abrasion. Steel-braided or reinforced rubber constructions typically withstand higher temperatures and resist chafing compared with basic rubber hoses. Corrosion-resistant metal fittings help prevent seepage at connection points.
Look for hoses with multiple reinforcement layers or stainless-steel braiding when you expect sustained high loads or elevated underhood temperatures. Construction also influences flexibility during installation and long-term dimensional stability.
Fitting Type and Compatibility
Correct fitting types ensure secure connections to the oil filter housing, cooler, and engine block. Matching thread patterns, flare types, or quick-connect ends avoids leaks and simplifies installation. Misfit fittings are a common source of oil seepage and can require disassembly to correct.
Confirm the line ends match the Scion tC’s factory attachment points and check whether adapters or replacement washers are needed. Kits that include the intended fittings reduce the chance of mismatches.
Pressure and Temperature Ratings
Oil cooler lines must tolerate the engine’s oil pressure and peak operating temperatures. Lines rated for higher pressure handle surge events and aftermarket cooling setups better, while adequate temperature ratings prevent softening or premature aging.
When assessing products, compare published working pressure and maximum temperature figures against the Scion tC’s typical operating conditions. Higher-rated lines offer a margin of safety for aggressive driving and longer service life.
Routing and Length Accuracy
Correct routing prevents rubbing, kinking, or contact with hot exhaust components. Lines that are too short can pull at fittings; lines that are too long may sag or contact moving parts. Both situations raise the risk of wear or leaks.
Choose lines that follow the factory path or come with routing instructions and mounting provisions. Some kits provide pre-bent hard lines or measured hose lengths to match the vehicle’s layout precisely.
Seal and Washer Quality
Seals, crush washers, and O-rings at connections are small parts that have an outsized impact on leak prevention. Using old or incorrect seals often results in slow leaks that are hard to diagnose. High-quality sealing components maintain a tight fit without over-torquing fittings.
Prefer kits that include new washers and specified sealing hardware sized for the Scion tC, or ensure replacement seals meet OEM dimensions and material specifications to avoid brittle failures.
Ease Of Installation and Included Hardware
An install-friendly line reduces labor time and the chance of installation errors. Clear instructions, correct-length hoses, proper fittings, and any necessary clamps or brackets simplify the job. Kits that omit essential hardware can extend installation time and increase frustration.
Consider whether you will work on the car yourself or use a technician. If DIY, favor kits with comprehensive hardware and straightforward routing guidance to minimize rework and potential leaks.
FAQ
How do I know when my Scion tC oil cooler lines need replacement?
Look for visible oil seepage at fittings, bulging or cracking along the hose, and oil spots where the vehicle is parked. Symptoms can include higher-than-normal oil consumption or a drop in oil pressure. Regular visual inspections during oil changes help catch early signs before they cause more serious issues.
Can I replace only one line or should I replace both feed and return lines at once?
You can replace a single damaged line if the other shows no signs of wear, but replacing both feed and return lines at the same time is often advisable. Doing both ensures matched material age and reduces the chance that the remaining original line will fail soon after, especially if both lines were exposed to the same heat and road conditions.
Are aftermarket oil cooler hose kits harder to install than OEM-style lines?
It depends on the kit. Some aftermarket hose kits are designed to match OEM routing and include the correct fittings and hardware, making installation comparable to OEM lines. Other universal or generic kits may require additional adapters or trimming, which increases installation complexity. Verify fitment information and whether the kit lists Scion tC compatibility before starting work.
What should I do if I find an oil cooler line leak?
Address a leak promptly by identifying the leak source and the affected fitting or hose section. In many cases, replacing the damaged hose or failed washer is the appropriate fix. If you are unsure, contain any leaked oil, avoid driving the vehicle extensively, and have a qualified technician evaluate the leak to prevent engine damage.
Do line fittings need special torque values during installation?
Yes, fittings typically have recommended torque specifications to ensure a proper seal without damaging threads or crush washers. Over-torquing can deform sealing surfaces while under-torquing may cause leaks. Consult service documentation for torque specs or follow the kit manufacturer’s instructions when available.
How We Chose the Best Scion tC Oil Cooler Lines
We focused on attributes that directly affect long-term reliability and vehicle compatibility for Scion tC oil cooler lines. Primary evaluation criteria included material construction and abrasion resistance, the integrity of fittings and crimps, OEM-style fitment accuracy, and rated pressure and temperature tolerances. We also considered ease of installation and whether the kit included necessary seals or mounting hardware. Products were excluded if they lacked clear fitment information for the Scion tC, did not specify material or pressure ratings, or used nonstandard fittings that would require custom adapters. Our goal was to prioritize options that minimize leak risk, match factory routing, and offer robust materials for high-heat engine environments.
Our full evaluation process is outlined in our review methodology.
Conclusion
When choosing Scion tC oil cooler lines prioritize correct fitment, durable materials, and proper sealing hardware. These factors directly influence leak resistance, installation ease, and long-term reliability. Balance material robustness with ease of routing and ensure pressure and temperature ratings meet or exceed your typical driving demands. Replacing lines proactively or installing a complete hose kit can reduce the risk of unexpected oil loss and protect the engine. Focus on compatibility with the Scion tC’s fittings and routing to minimize installation time and future maintenance.
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