I notice that the M1 0w20 is rated ACEA A1, which is not too shiney methinks.

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Jay

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I think Mobil 1 deliberately formulated the oil to have a HTHS of 2.61. This is just on the lower edge of 20-weight. I believe they did this to distinguish the oil from their thin 30-weights. Why would anybody go to the bother of using 0w-20 unless it's going to offer significantly better gas mileage than 5w-30?
 
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