Kimber_45, have you conducted any experiments to prove this oil company's theory or is this just what the major oil company tells you? I contend that if motor oil being added to low sulfur diesel fuel damaged a diesel engine then the same oil in the crankcase of a gas engine would damage the gas engine as some oil blows by the rings and as the engine runs. But I know it doesn't cause damage with combustion chamber deposits.

My friend's fleet maintenance records prove that injector pumps with oil added to the diesel fuel last at least twice as long as without it and he has had no problems with combustion chamber deposits.

Please tell us exactly what are these secret "lubricity additives" that the major oil company uses that lubricate better than motor oil.