Engine-oil groups

Messages
250
Location
Phoenix, AZ USA
You guys frequently use terms like Group 4 to describe engine oils. I've searched this and API's sites for the definitions, to no avail. Could someone pls post a link to the API definitions?
 
Messages
52
Location
Poquoson, VA.
I just happened to ask that same question a few days ago. I received some great info! I too was curious as to what it all meant, and those answers summmed it up.
 
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