All experiences with the viscosity improver have not been good. Or at least it is not worth the chance if there is any truth in the stories.

Something about a mass being found in some of the oil pans comes to mind. May be an old wives tale by the way as well. This was on non mercedes vehicles.

The most important factor of using the straight thirty is the lack of certain additives to keep the soot in suspension as well as the inadaquate viscosity when used alone.