Detroit 60 Over Filled Engine Ool

When it comes to overfilling an engine with oil you have to take into consideration the amount overfilled compared to the capacity at full, most Detroit 60’s hold roughly 10 gallons and I say roughly because even the manual says it varies depending on specifics but Ide say within half a gallon. You said it was a gallon overfilled which is 10% of your oil capacity..... I work with c12 & c15s mostly but from experience encountering trucks that are overfilled by roughly 30% of their max capacity when they come in and they are fine... never even throws a code, you would start running into serious trouble roughly 50% overfilled and left un-noticed, engine oil fill level is way more lenient than a transmission, I believe your problems are unrelated

 

I would not get into that particular issue too much. Oil is the life blood of a heavy engine.

You probably will have a certain amount in there, monitoring with that stick pretty regularly with notes taken will eventually remind you how it was when you first got it.

 

1 gallon over full will not do any damage your fine. The engine has no sensors for oil level other then oil pressure it self so all those dash lights have nothing to do with being 1 gallon over on the dip stick. Maybe look see if he knocked some wires off somewhere. Your egr has nothing to do with an oil change.