Ok, here goes another oil related discussion… I have heard several opinions on using diesel oil in a gasoline engine. Some say this is a great idea for the engine internals while others say it isn’t the correct application. All agree that the higher levels of anti-wear additives might shorten the life of emissions related components over time like the cat, O2 sensor, and the like.
I have put some diesel oils in some of my air-cooled equipment as it doesn’t have emissions components to foul. I have used Rotella synthetic 10W30 and 5W40 in these engines and know to avoid oil that might be way too thick. I figure these are harder working engines that operate in dirtier and hotter conditions that more approximate a diesel engine. I know others who do the same and no one ever complains about an engine related failure. I suspect that a big part of the life of these engines is actually changing the oil as I know many who just run them until they lock up or blow a rod through the side.
Are there any other main drawbacks to using diesel oils in a gas engine or not? I know others that run them in vehicles and everything seems fine for the moment. The only other thing I can think of is that the additive package may break down in the presence of gasoline combustion products as these are likely far different.