Camshaft Lube

You guys need to realize that the Diesel oils on the shelves have now dropped the zinc package as well....the 2007 Diesel emmisions requirments have tightened up the restrictions. With the new fuel and the new particulate filters ont he diesel trucks the ZDDP package was yanked out of the diesel oils as well. Now they still have some but not near as much as they used to. You should be running a racing type oil to get full protection...something like Royal Purple, Redline, Brad Penn or Valvoline VR1. Look on the Diesel oil package and if it says SM or CJ-4 put it back on the shelf cause that's the stuff for the new diesels. IIRC the oil diesel oil that still meets the new specs and kept the zinc package or most of it anyway is the Valvoline Premium Blue.