Oil level

KpaxFAQ said:

Maybe I don't run my OCI enough to notice any loss on the dipstick. I still have yet to see anyone get a UOA on a CTD from somewhere other than blackstone that actually properly tests for fuel (other than me). I'm still curious about that because I had several percent fuel in my oil sample last time I tested. No noticeable oil consumption, if anything it seemed like it rose slightly. Rising oil levels have been problematic for some vehicles both gas and diesel that suffer from a lot of fuel dilution.

Click to expand...

Well, you are correct, mostly.

If any engine is short tripped.......let me define that better, an engine that is operated, in colder weather, without reaching and maintaining operating temperature for a minimum of 30 minutes, will indeed often see a increase in oil level (dilution) and this is a result of the temperature change within the engine and the imperfect seal of cold rings in a cold cylinder.

Few folks notice it because few folks even check their oil level.

Now, that same engine (this is gas or diesel btw) with, say, 3000 short trip miles and the attendant moisture and fuel diluted oil, is taken on a 500 mile road trip.
Two things will occur.......the accumulated moisture will finally burn off (lowering the oil level) and because the oil is slightly thinner, due to dilution, will get past the oil rings and be consumed.

The short trip example will cause folks to think their engine makes oil............that same person, after the trip (now 1000 miles) checks their oil and now finds it has lowered, making them think the engine has a problem.

Now, stand in my shoes and try to explain that to a non car person.......they will be certain I am FOS.

Rob