Quote: I run Shell 15w-40 Rotella diesel oil. You need the Zinc for your cam. Most passenger car oil had the zinc reduced to a potentially dangerous level.
And the current Rotella has reduced zinc levels to a point much less than the original.It is no where near the old Rotella.Truck emission standards are being raised by the manufacturer and the oil is being blended to coincide,so don't take it for granted that you are home free.If you are set on diesel oil,Chevron Delo has more zinc than the Rotella.
