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Originally Posted by nyc3r
wonder why ppl keep on saying mobile1 5w30 is no good for the e90.
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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.