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Ask Mobil Archive -
API Ratings
DateQuestionAnswer
08/17/2010
Address Conflicting Advise on Whether Mobil 1 Extended Performance Can Be Used in Diesel Engines
The Mobil 1 Extended Performance oil quart bottle has written on it for GASOLINE ENGINES ONLY. But on the website it says can be use in diesel engines that meet the requirements. Is that statement cor...
Since Mobil 1 Extended Performance meets or exceeds the most current requirements of the International Lubricant Standardization and Approval Committee (ILSAC) for gasoline engines, the bottles carry ...
10/19/2007
Will Mobil Oils Continue Providing SL Rated Protection
API SM appears to be a step backwards in regard to engine wear. Will Mobil oils continue with SL rated protection in its oils? Many now have SL off their bottles but show SM.
Yes, all our motor oils that are providing API SM quality level are also backward qualified for earlier service categories such as API SL, SJ, etc.
09/04/2007
Explain the Terms on the Oil Bottles such as API SM/CF
What exactly does API SM/CF and SL,SJ,SH,SG mean on the oil bottle?
API stands for American Petroleum Institute. In this case, API sets the industry standards for passenger and commercial vehicles.  These standards are recognized, and in many cases, developed in conju...
06/28/2007
Can Today's Mobil 1 15W-50 be Used in Diesel Engines?
When I first bought Mobil 1 fully synthetic 15W-50 it stated on the container that it can be used in diesel engines. The newest batch I bought does not state that any more. Can I still use it in my di...
Originally, Mobil 1 15W-50 was approved for API CF but because most diesels today require a higher quality, we elected to stop claiming API CF for the product. For older diesels where API CD or API CF...
09/18/2006
Using an SM-Rated Oil When an SG-Rating is Recommended
I just purchased a '92 Corvette and after changing the oil to Mobil 1 Extended Performance I noticed on the hood that it recommends an oil with the API rating of SG. After looking at the empty contain...
API ratings are backward compatible to previous generation ratings. This means that an API SM quality oil, which is the latest API rating, is recommended where API SL, SJ, SH, SG were originally requi...
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