quote:
Originally posted by satterfi:
That's intersting that M1 15w50 can't hang with M1 0w40. Why would that be?
229.5 has a prety stringent fuel economy requirement that the 15w50 couldn't meet. In fact, Mobil 1 0w40 is the only Xw40 oil on the 229.5 list. The rest are 5w30.
And don't let the 35,000 mile interval mislead you. All that means is that under ideal conditions (which are determined by the FSS onboard computer of a Mercedes auto), a 229.5 oil must be capable of going 35,000 miles. Under more typical driving conditions, the computer will indicate a change is necessary in the 15,000 to 20,000 mile range.
As for Amsoil, two of their oils are on the 229.3 list: 10w30 and the Series 3000 5w30. (And Schaeffer's Micron Moly and 7000 oils are 229.3 approved, too.) It will be interesting to see if any Amsoil oils eventually show up on the 229.5 list.