Synthetic versus Mineral oil in lubricants

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Except todays conventionals and todays syn. oils are vastly different that the oils in the 1980s
 
The finished oils are. group II or Group I are still mineral, and some group III might be considered close to Polydecenes in some areas.

These are talking about the base oils really. Read it. Then think of all those pictures of pulled valve covers...
 
Thanks for the share
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