Originally Posted By: tig1
In 10K OCIs my Ford Duratech I4s never drop off the full mark. My previous Focus never did as well even at 175K. Oil used M1 0-20AFE.
This is my experience as well, except that my 2.5 is up to 238,000 miles, and I run anywhere from 5w20 to 10w30, conventional through full synthetic. The oil is always right at the full mark, even after 8,000+ miles.
Yeah, I'm sure there's been SOME oil used during that time, but it's not really measurable.