Supertech 20w50 API-SP

That is a great flashpoint! Conventional oil I presume? SP is just the next step after SN? Forgive my ignorance, what does SP do over SN?
 
SP was the latest and greatest, not sure what's better about it other than low speed preignition maybe. Standard conventional oil, was suprised to see SP in that grade.
 
Just saw a guy at Wal-Mart grab 5 jugs of this stuff. Chatted a bit, he said it was for his 5 family cars that he owns/maintains. Oldest car in that fleet is a 2014 model, all cars are in 40k-100k range.
 
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