Re: Difference in oils for gas and disel

Posted by Jon Hagen on May 11, 2006 at 19:06:53 from (69.26.29.199):

In Reply to: Difference in oils for gas and disel posted by Paul in ON on May 11, 2006 at 17:45:02:

look at the API circle on the jug,if it has a rating that starts with S (SF-SG etc) then it is rated for "spark" ignition engines. If it also carries a C rating (CF-CG etc) then it is also rated for "compression" ignition engines or diesel. Many oils carry the additive package for both gasoline (S) engines and light duty(C) diesel engines.

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.

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