What make SM different from SL

[Islandvic]

What makes SM different from SL.

Does the API make this spec?

Do they work in conjunction with automakers?

Can SL work with most domestic pre 2004 vehicles?

 

[haley10]

quote:

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Originally posted by Islandvic:
What makes SM different from SL.

Better cold cranking #'s. Reduced levels of phosphorus under 800 ppm. Better cold cranking and lower zddp is the most significant.

Does the API make this spec?

This is an API spec.

Do they work in conjunction with automakers?

Yes, Japanese man. have been reluctant to have the phosphorus cap reduced too far.

Can SL work with most domestic pre 2004 vehicles?

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Yes. SM shouldn't be required until 2005 models.