<< The scoop seems to be that Rotella-T has the most zinc and other additives that are good for the engine. It seems that some of the other petroleum based oils removed some of these additives. Maybe because of the catalytic converters? >>>
Rotella-T is an oil formulated for diesel engines.
Steve
17 Year Independent AMSOIL Synthetic Lubricants Dealer
www.lubedealer.com/HiTechOilCo <--Free catalogue