[kench]

I had a Blackstone test done two oil changes ago, and I had 5.5% fuel in oil.
Last test (4,000 miles on oil), they were short, and could NOT do a flashpoint, so no fuel in oil reading. They said to just keep an eye on the dipstick to make sure oil level isn't rising. My question is, at what percentage is the fuel in oil too high, and a trip to the mechanic is necessary?

 

[schoolde]

What causes fuel to get into the oil? I just changed mine over the weekend, and when I checked it yesterday it showed overfull. It was a little high when I finished changing it, but I drained about a quart out yesterday, am going to check it again tonite, always check it in same place(garage) and after it has set fot at least 1/2 hour, what problems will occur with overfill of oil?

 

[kench]

I beleive leaky injectors can allow fuel to get into your oil.
Also "wet stacking", which happens if you let your truck idle for hours on end.
Fuel in the oil dilutes the oil, and changes the viscosity, thus keeping the oil from doing its job fully.
If the level of oil on your dipstick keeps rising, but your not adding any oil, you have fuel entering the oil, taking up space.
As far as overfilling the oil, I think that can lead to "foaming" of the oil, and again, it's not coating as well as it could with no foam.

Take everything I say with a grain of salt, because I am by no means an expert!

HK