How much burnt oil is too much???
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WRAH
Joined: Aug 2003
Posts: 5,708
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From: Columbus, OH (Area)
How much burnt oil is too much???
1/2-3/4 of a pint of oil gone/burnt between changes 4000~5000 miles???
I've heard of worse, also, how rich is our mixuture? I'm smelling alot of fuel in the oil?
I've heard of worse, also, how rich is our mixuture? I'm smelling alot of fuel in the oil?
Registered User
Joined: Dec 2003
Posts: 2,514
Likes: 5
From: Marietta, Georgia
Except when you accelerate the G35 [and all OBD1&2] engines run at or near 14.7AF ratio.
Most oil loss in new engines [under 100,000 miles] comes from the fact that the light components in conventional oil evaporate [up to 20% by volume] in heat and travel up thru valve covers thru pcv system and are feed into plenum where they get burnt with incoming charge.
So 20% [up to a quart] between 90 day/3750 mile changes could be considered normal depending on oil brand and weight. FULL Synthetics being more stable and more uniform should only "vaporize" 5-7%.
Now improper [breakin or positioning] ring set/tension is another situation!
Most oil loss in new engines [under 100,000 miles] comes from the fact that the light components in conventional oil evaporate [up to 20% by volume] in heat and travel up thru valve covers thru pcv system and are feed into plenum where they get burnt with incoming charge.
So 20% [up to a quart] between 90 day/3750 mile changes could be considered normal depending on oil brand and weight. FULL Synthetics being more stable and more uniform should only "vaporize" 5-7%.
Now improper [breakin or positioning] ring set/tension is another situation!
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