2010 Lexus RX 350 (AL10) · Known Issue
2010 Lexus RX 350 Engine Oil Cooler Pipe Leak: What It Really Costs to Fix
Quick answer: 2010 Lexus RX 350 engine oil cooler pipe leak typically costs $300 to $1,000 at an independent shop, depending on which component failed.
Applies to: every version of this generation.
What the Issue Is
Lexus service bulletin L-SB-0154-11 (December 2011, revised in December 2014) covers some 2007 to 2011 RX 350 and 2010 to 2011 RX 450h vehicles that may leak or seep engine oil from the engine oil cooler pipes, the lines that carry oil between the engine and its oil cooler. The repair replaces the oil cooler pipe assembly. In July 2014 Lexus announced a Warranty Enhancement Program (ZLC) that extended warranty coverage for repairs of leaking or seeping oil cooler pipes. Its time and mileage limits are set out in the Lexus dealer letter; a Lexus dealer can check a VIN for coverage, and on a car this old you should not assume any remains.
A seep shows as oil wetness and grime around the pipes and an oil level that drops between changes. A larger leak can lose oil quickly: owners have reported oil cooler pipe failures that drained the engine, followed by engine repair bills in the thousands. That is why a leak here is worth fixing at the first sign rather than topping up.
This is a different part from the VVT-i oil line in Lexus limited service campaign 9LH, which covered 2007 to 2009 RX 350 and 2007 to 2008 ES 350 models and did not include this generation. For a 2010 or 2011 RX 350, the oil cooler pipes are the oil line to check.
Symptoms to Watch For
- 1.Oil wetness or grime around the oil cooler pipes, low on the engine
- 2.Oil spots under the front of the vehicle
- 3.Oil level dropping between changes without blue exhaust smoke
- 4.Low oil warning or oil pressure light after a sudden large leak
- 5.An engine undercover coated in oil when it comes off for service
Real Repair Costs
Independent-shop pricing for replacing the oil cooler pipe assembly. RepairPal's estimate for oil cooler line replacement on an RX 350 is about $267 to $324; owner bills that added gaskets and an oil change ran close to $1,000, and one dealer quoted about $600 for a preventive replacement.
| Repair | Typical Cost (installed) |
|---|---|
| Oil cooler pipe assembly replacement, installedwith new gaskets and fresh oil | $300-$1,000 |
| Engine repair or replacement after the oil ran outowner-reported quotes, the outcome early repair avoids | $3,800-$8,500 |
Moderate issue. Ranges are US independent-shop estimates with quality parts. Use them as negotiation grounding, not a quote.
Mechanic's Tip: Spot It Before You Buy
Ask for the service records first: a Lexus dealer invoice for the oil cooler pipe repair under bulletin L-SB-0154-11 or the ZLC program settles the question. Without one, pull the dipstick (a low level on a car with a fresh service sticker is a warning), then on a lift have the inspection tech trace the oil cooler pipes low on the engine for wetness or fresh grime. Any active seep goes into your offer as a $300 to $1,000 repair to do before long drives.
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Frequently Asked Questions
Was the 2010 RX 350 part of the VVT-i oil line campaign?▼
No. Lexus limited service campaign 9LH covered the VVT-i oil line on 2007 to 2009 RX 350 and 2007 to 2008 ES 350 models, and that campaign has since ended; the 2010 and later RX 350 was never included. The oil line issue documented for the 2010 to 2011 RX 350 is the engine oil cooler pipe, covered by bulletin L-SB-0154-11.
Is the oil cooler pipe repair still covered by Lexus?▼
Ask a Lexus dealer to check the VIN, and do not count on it. Lexus extended warranty coverage for leaking or seeping oil cooler pipes under a Warranty Enhancement Program (ZLC) announced in July 2014, but warranty enhancements run for a set time and mileage, and a 2010 or 2011 RX is now 15 or more years old. Budget for the repair unless the dealer confirms coverage.
How much does it cost to fix an RX 350 oil cooler pipe leak?▼
About $300 to $1,000 at an independent shop. RepairPal's estimate for the line replacement is about $267 to $324, owner bills that included gaskets and an oil change ran close to $1,000, and one dealer quoted about $600 for a preventive replacement. If the pipe lets go and the engine runs low on oil, owner-reported engine repair quotes run from about $3,800 to more than $8,500.
What happens if the oil cooler pipe fails while driving?▼
Oil pressure drops and the oil warning light comes on. Pull over and shut the engine off at once, because every second it runs without oil wears the bearings. Cars shut down promptly often need only the pipe repair, an oil fill and a tow; cars driven on are how these engines are lost.
Sources
The facts on this page were last checked against these documents on October 10, 2026. Programs and their coverage end; check the car's VIN with a dealer for what still applies.
- Service bulletin: Lexus bulletin L-SB-0154-11 Rev1 (December 2014): engine oil cooler pipe leak or seep, 2007-2011 RX 350 and 2010-2011 RX 450h (NHTSA file) (static.nhtsa.gov)
- Warranty program: Lexus ZLC Warranty Enhancement Program (July 2014): engine oil cooler pipe (NHTSA file) (static.nhtsa.gov)
- Service bulletin: CarComplaints: 2010 Lexus RX 350 TSB list (oil cooler pipe bulletin and enhancement letters) (carcomplaints.com)
- Warranty program: Lexus pressroom: Limited Service Campaign for VVT-i oil line (2007-2009 RX 350, 2007-2008 ES 350) (pressroom.lexus.com)
- Reference: Car Spec (shop article): Sienna, Highlander, Venza and Lexus RX 350 oil cooler leak or seep (carspecmn.com)
- Repair cost estimate: RepairPal: Lexus RX 350 repair costs (engine oil cooler line replacement) (repairpal.com)
- Owner reports: Lexus Owners Club: oil leakage defect thread (oil cooler pipe failure) (us.lexusownersclub.com)
- Owner reports: Lexus Owners Club: cautionary tale, total oil loss (us.lexusownersclub.com)
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