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#1
12-29-2003, 12:34 PM
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Diesel and Gasoline Engine Oil
I looked today at the American Petrolium Institute (API) web site and I finally found out for certain the 'S' + 'C' designations on motor oil. According the the site:
'S' is for Service, and only applies to gasoline engines in cars, vans, and light trucks. 'C' is for Commercial and only applies to diesel engines in heavy-duty trucks. The site is www.api.org - in the search feature type "motor oil guide shelf card" I post this information to help clarify some of the questions I've had regarding the letters. I thought they stood for 'Spark' ignition + 'Compression' ignition, but, at least according to the API I was mistaken. Hve a great New Year!
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1992 500SEL 25K 1995 E320 40K 1995 SL600 120K 2002 JX8 Sport 43K 2005 Volvo S40 95K 2006 Isuzu NPR 304K (Frankencamper) 2007 Crown Victoria 150K 2014 Smart Electric 20K 
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#2
12-29-2003, 08:24 PM
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Thanks for sharing that info. I've known about the C and S designations because I had read an old MB Club article by Frank King (I think) about oils (the ABC's of OIL) and I don't think many people know the history of engine oil. I was surprised at the amount of additives in regular oil.
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dtf 1994 E320 Wagon (Died @ 308,669 miles) 1995 E300 Diesel (228,000) 1999 E300 Turbodiesel ( died @ 255,000) 2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop 2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army BMW 330 xi 6 speed manual (175,034 miles) 2014 E350 4Matic Wagon 128,000 miles 2018 Dodge Ram 21,000 miles
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