The black stuff is not gritty at all. So I don't think it's metal.
My guess at this point is that ML uses unique detergents and seal conditioners that found some area of the engine it cleaned up a tad.
I'm going to stick it out for 3k miles.
Valvoline does claim their HM oils have more detertents than they synthetics.
My guess at this point is that ML uses unique detergents and seal conditioners that found some area of the engine it cleaned up a tad.
I'm going to stick it out for 3k miles.
Valvoline does claim their HM oils have more detertents than they synthetics.