Originally Posted By: Garak
Originally Posted By: SteveSRT8
Some cars don't use enough oil to be measurable during normal factory spec'd OCI's. Some do. My 6.1 liter engine is widely known for some oil consumption, yet my car uses none, even on track days. I have a van with over 400k miles that uses none. Yet another truck in the same fleet uses some with only 100k miles.
Absolutely. We had some high mileage taxis that burned no oil, and others with the same engines that did. In fleet usage, we didn't worry about it unless it was ridiculously high, or if all vehicles were burning, in which case we might have considered a different oil.
Exactly.
Our routine around here is watch for consumption. To us that is anything over a quart a week or so, probably 600-1k miles. If there is usage I then check all the possibilities like leaks, PCV, etc. Once those are eliminated we will now use Kreen. If that does not help we would then go up a grade.
My 400k mile Savana 3500 works every day and uses less than 1 quart between OCI's. These OCI's occur at about 4000miles and many many hours of stationary operation at 1500-1700 rpms.