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Originally Posted by Polygon  I was running Mobil 1 until I found out they had switched to group III. I still think it's the best oil for the price and you should use nothing less. |
This myth just won't die! M1 has never been proven to be a group III oil. If enough people repeat something even when it is not correct many will join the bandwagon and blindly follow.
As a side note many of the Group III oils outperform the group IV oils, Penz Platinum comes to mind.