Quote:
Originally Posted by pbanders
Usually, oil smoke only on overrun is due to bad valve seals and/or guides. High intake manifold under closed throttle conditions pulls oil past worn guides/seals and into the intake. If you have worn/cracked/broken rings, or improperly seated rings, you'll get oil smoke not only on overrun, but on part and full load, and often on startup as oil will pool in the cylinder.
I completely agree with you that the 1 qt per 1000 miles criteria is dated and shouldn't apply to modern engines. That said, do a Google search on "normal oil consumption" and you'll see gobs of references on modern engines that cite this criteria. Fact is that anyone with consumption of 1 quart per 5000 miles will find the dealer not willing to do anything about it. I suggest going on record with it so that if consumption increases dramatically, you'll have shown that the problem was there from the start.
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Quite correct. Thanks.
valve guide seals are more prevalent oil leakers. The intent was to see where oil loss is occurring. It indeed there is blue exhaust on over run Honda should warranty repair, even if its a new engine.
Our experience has been that oil loss on a newly built engine more likely resulted from misinstalled rings than seals. Seals are easier to do.
In the long run seals fail much quicker than rings. cheers