Just a tibit of information that I had ran across a few months ago. I read an interesting article in Hemmings Muscle Machine discussing some of the issues of oils and their specifications. As newer engines are developed and used, engine oils will also change to meet the specifications of the newer engine. This implies that as we go from engine to engine- the oil will change also. Engine oils deveopled 20 years ago is not the same oil that is currently being used. Is todays oil really any better than the oil of 20 or 25 years ago? This is still an open debate on this particular issue. However, the author of the article did say that there should be no problem in using todays engine oils meeting Diesel engines specs for they contain the same detergents that gas engine oils had in them 20 years ago. Don't know for certain about this but I do have a car that I may try it on and sees what happens, if anything. Any comments would be welcomed.