| [GMCnet] ZDDP [message #234719] |
Wed, 01 January 2014 12:47  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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John made a good distinction between cams that are. As we say, broken in. An a new installation. It's going on 7 years since the oil with the SL rating was changed to SM due to formulation changes. And it SEEM to be that the hype was somewhat overstated for the daily driver. The SM, SN. and SO have been doing better then first expected. And the drain down time with RV's that set for long periods of time There is a big difference between the engine that is drive every day. To the one that sets for months. The level of ZDDP is still vary important at break in, and long term storage. The oil that I get is from Northland oil. They make oils for John Deere, Caterpillar, Case IH, and other agg equipment companies. The oil I get from them has the C, an S rating. Some oils are listed in that manner. I'm NOT a chemist. I just do what they say.Bob Dunahugh.
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| Re: [GMCnet] ZDDP [message #234732 is a reply to message #234719] |
Wed, 01 January 2014 16:06  |
Ernest Dankert
Messages: 133
Registered: May 2007
Location: Ogden, New York
Karma: 1
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Senior Member |
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C is for "compression" ignition, ie diesel and S is for "spark" ignition, gas. We used diesel for gas and diesel but not S for diesel. Your mileage may vary.
1977 Eleganza II
Ogden NY
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