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

[williar]

I'd think it would need to be rated ACEA A5, like the 0w30 is, to be acceptable. What do you think?

 

[Jay]

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?