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API Ratings
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 industry standards for passenger and commercial vehicles. These standards are recognized, and in many cases, developed in conjunctio...
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...
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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