Losing engine oil

Tiny
MOHAMED HUSSIEN
  • MEMBER
  • 2001 LEXUS LS 430
  • 4.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 145,000 MILES
Hi there. I have the car listed above which is driving me crazy by slowly losing oil. It loses around 1 quart per month. I think I've replaced every seal that could've been replaced or anyone could think of.
the rear crankshaft seal(which involved the removal of the transmission) - replaced.
valve cover gasket - replaced.
PCV valve - replaced.
engine oil pan gasket - replaced.
maybe engine is burning oil? No smoke is coming out of my exhaust, even with the highest RPM revs.
maybe head gasket is blown? Engine oil and coolant both looks super clean.
I really love this car and don't want to sell it. But this continuous oil decrement is driving me crazy.
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Saturday, January 16th, 2021 AT 3:58 AM

1 Reply

Tiny
ASEMASTER6371
  • EXPERT
Good morning,

It could be burning the oil. When it burns oil slowly as in your situation, the catalytic converter can absorb the oil and it will not produce any smoke.

https://www.2carpros.com/articles/blue-smoke-from-engines-exhaust

I would do a wet and dry compression test to determine if the rings are the issue.

https://www.2carpros.com/articles/how-to-test-engine-compression

Normal oil consumption is 1 quart every 800 miles.

Roy
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Saturday, January 16th, 2021 AT 4:48 AM

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