when is first saw the title to this thread, i thought it was about what was the worst oil change that you have done on you own car.
mine would definitely have to be wolfs head oil that wasn't diesel rated (but mistakenly said it was) which i put in my 240D, along with a Wix oil filter (napa gold) which had a gasket that did not fit properly on top of the the oil filter canister, and started leaking oil as soon as i would crank the engine. needless to say that Oil and filter combo didn't last more than 24 hours in my 240D.
mine would definitely have to be wolfs head oil that wasn't diesel rated (but mistakenly said it was) which i put in my 240D, along with a Wix oil filter (napa gold) which had a gasket that did not fit properly on top of the the oil filter canister, and started leaking oil as soon as i would crank the engine. needless to say that Oil and filter combo didn't last more than 24 hours in my 240D.