My 131,000 mile Lexus GS 350 (3.5L V6) is losing oil. First noticed this summer in NC. Brought car to Toyota dealer, was down about 2 qts. Checked it in about 1,000 miles and was losing more. Drove 2 1/2 hours to Lexus dealer. They put car on lift and showed me that they could not see an oil leek. Did full oil change (told me the Lexus dealership had used synthetic oil, not regular oil as needed, just before I went to NC). Seemed ok when I checked it at 500, and then 900 miles. Now was way down again. There is NO oil leak in my garage. I do not see blue smoke. What should I do next?
Thanks.
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Hello,
This is certainly consumption, as the only other path is to leak.
I would be surprised if the owners manual recommended against a synthetic oil. In fact, I would be surprised if Lexus would put a non-synthetic oil into the engine.
With the absence of blue smoke, I am inclined to think that the engine in only using a small amount of oil at a time, but all the time. This leads me to think piston rings.
If you notice blue smoke at startup when the vehicle is cold, the valve seals are likely the cause.
