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API Ratings
Difference Between API SH and SJ Standards
What is the difference between SH and SJ oil? Can SJ be used in place of SH?
API SJ quality engine oils are designed to be backwards-compatible with the earlier category engine oils, in this case, API SH.  API SJ quality oils are designed for 2001 and older automotive engines,...
Why Doesn’t Mobil 1 10W-30 Still Have the API CF Mark?
Your 10W-30 full synthetic had an CF classification and now it doesn't. I have been using it in my Kubota diesel. I hope it doesn't damage my engine. What gives?
API discontinued licensing engine oils against the API CF specification on December 30, 2010. Though Mobil 1™ 10W-30 motor oil still meets the performance requirements of the classification, with its ...
What API Spec Applies to Oil for Turbo Engines?
I have an '86 Chrysler Le Baron, 2.2 turbo engine. Until now I used  the API SG/CD spec. engine oil, which I can't find anymore. The CD spec, I know, is very important for turbos. Did the spec letters...
The API Service Category SG is now obsolete.  Since API SG was introduced, the use of turbochargers has risen dramatically.  The most recent API Service Category (API SN) was developed with turbocharg...
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 ...
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.
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