Originally Posted By: 4WD
Just used Mobil 1 HM in 10w30 - it is SL A3/B3
I also use regular 10w30 Mobil 1 - GL5 and A1/B1
If you have the choice between Mobil 1 HM as a 10W30 & 10W40 and they're both labelled as being full synthetic and are the same price, then go for the 10W30. Less VII, lower Noack and a modicum of fuel economy make 10W30 the logical choice.
Just used Mobil 1 HM in 10w30 - it is SL A3/B3
I also use regular 10w30 Mobil 1 - GL5 and A1/B1
If you have the choice between Mobil 1 HM as a 10W30 & 10W40 and they're both labelled as being full synthetic and are the same price, then go for the 10W30. Less VII, lower Noack and a modicum of fuel economy make 10W30 the logical choice.