Specific Gravity of Diesel Fuel VS Motor Oil
The reason for the question is....in the event of an injector not closing properly and letting fuel leak into the cylinder will diesel fuel float on motor oil or is it reverse?
Forum Discussion
Diesel fuel is quite soluble in lube oil. If your crankcase level is increasing with no indication of water present then what you have is known as fuel dilution. It is quite common in the large marine diesels I have worked with. You need to not only change your oil but find out where the fuel is leaking into the engine. Many diesels have been ruined by fuel dilution. Usually the only indication is rising crankcase level and possibly but not necessarily a decrease in oil pressure. I'm sorry. I know this is bad and probably expensive news. Good luck. -Mark.
