I use the Rotella in all of my older MOPARS and in my 1981 diesel farm tractor.

A fellow MOPARTS member was recently in his local Tractor Supply Co. store and he told me that they still carry motor oil with zinc and the real, old style green antifreeze. My guess is that some of the older farm tractors and other equipment must have the oil with zinc as well as the old style antifreeze. I know that this is where I am going to purchase my next batch of antifreeze if I can't find the old style locally.

Bill