Posted by Traveler on March 06, 19100 at 23:22:05:
In Reply to: Re: PS it's a K2500 with the snow plow option front end nt posted by Mike T. on March 06, 19100 at 14:52:36:
Old diff fluid will start to foam when it breaks down. That could be it. Changes needed at 25K miles.
Mobil 1 is 75W-90 with no additives front or rear.