What year was switch made from SL rated oil to SM

[40ford]

I have 2gals. of Chevron Supreme 5w-30 SL rated oil. I wanted to know if it OK to use in 2001 GMC Yukon 5.7L. engine.

I am about to roll up on the Auto RX rinse phase. It is the only oil I have on hand that is not synthetic oil.

 

[TallPaul]

I don't know, but if you are trying to age the oil, check for a date code and call Chevron to get the interpretation. Then you will know exactly how old it is. Otherwise, if you are trying to bracket the age, you also need to know when SL came out for the oldest it could be. Bottom line though is that you should be fine to run this oil, but I would shake it well in case there was some settling during storage.

 

[flatlandtacoma]

Your 2001 vehicle was originally specified for API SJ, so you can use SM, SL, or SJ rated oil.

See page 2:

http://www.api.org/certifications/engineoil/categories/upload/EngineOilGuide2006.pdf

 

[lostwrench]

November 2004.

 

[40ford]

Thanks for the info. It is just what I needed.

40ford

 

[Cutehumor]

40 qts of my stash is SL grade. about 3 more years to use it. hehe

 

[eljefino]

Sometimes the dipstick actually says what grade, especially on GM cars.

 

[artificialist]

What is funny to me is that many Hyundai cars made in 2006 still have "Use 5w20 SL/ILSAC GF-3" written on them.

 

[Bill in Utah]

Quote:

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What is funny to me is that many Hyundai cars made in 2006 still have "Use 5w20 SL/ILSAC GF-3" written on them.

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Because SL grade oil (any type) is EXCELLENT oil!

Most of the cars that require SM have some Low emissions stuff that need to have to SM adds.

Bill