Originally Posted by nyc3r
wonder why ppl keep on saying mobile1 5w30 is no good for the e90.
The reason is that the version sold in the United States is ACEA A1, on the thin side of the range of what is a 30 weight oil and has an HTHS of 3.09. It Also lacks BMW LL-01 approval.
On the other hand the Mobil 1 5W-30 that you can buy in Europe, like the oil your BMW dealer is using
, meets BMW LL-01/-04 specs and is ACEA A3. So you see that not all Mobil 1 5W-30 oils are the same.
The Mobil 1 oil available in North America that is closest to the BMW oil that your dealer is using
is 0W-40. This is a very good oil, recommended not only by BMW but by MB, Prosche and VW/Audi. It is no accident that this is called "European Formula".
The North American Mobil 1 5W-30 is a good oil, and I have used a lot of it with good results--in applications where it is appropriate. However it is not intended for 18,000 oil changes, and its lower HTHS compared to the BMW synthetic should raise a flag.