If you've ever examined the packaging on your engine oil, you may have noticed a letter C among all the other information.

What Every Street Rodder Needs To Know About Engine Oil - Street Rodder Magazine. ... API's service code appears on oil packaging and is often referred to as the donut.

Checking the oil level is a quick, easy job that we recommend you do at every other gas fill-up. All you’ll need is a rag or paper towel, and your car’s owner’s manual if you have questions.

FA-4 is one of two new API donuts that started appearing on heavy-duty engine oil packaging late last year; the other being CK-4. CK-4 oil is the one the vast majority of fleets are now using (or ...

In a modern engine, with its plastic covers and shoehorned packaging, this can range from "minor pain" to "impossible without major disassembly." Same goes for some older stuff as well.

If you've ever examined the packaging on your engine oil, you may have noticed a letter C among all the other information. Here's what that means for your oil.

There's a lot of information on the packaging for your engine's motor oil, but the S designation may be one of the most important to look for. advertisement. SlashGear.

Engine oil products that have the API category and ratings, including the S on their containers, have undergone the voluntary Engine Oil Licensing and Certification System – EOLCS from the API ...