Difference in oils for gas and disel

Ask your engine manufacturer as to the recommended TBN should be if the value is not in your literature.

An interesting story in one of my performance car magazines,is that modern S(gasoline) only engine oils are now formulated for engines with roller cams/lifters which have been standard for the last 15-20 years,have almost none of the additive needed to protect a flat tappet cam/lifters. This additive will mess up cat converters and oxygen sensors,which the car makers must now warrenty for 100,000 miles,plus very little of the additive is necessary with modern roller lifter engines,so it has been almost eliminated. The story said for your older gasoline engines with flat tappet cams,you should now use only heavy duty diesel oil which still has enough of the additive to prevent wear on flat tappet cams.