Look, I don’t think people are disputing that the owners manual says to use M1 5-30. Just that it may be a typo as the 5-30 in Europe is different oil, and that may be where it came from. Mobil in the US only lists 0-40 as applicable for a modern BMW, so that is what I use. You are free to use what ever oil you want. It’s your car.
I agree with your reasoning for oil choice, but am curious about your statement of less wear. Is that based on the fact that a thinner oil will get up into the head and cyl. faster on start up? If so, wouldn't the 0-40 do a better job as it has a lower cold viscosity?
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Originally Posted by 300B
No I am not.
I like to go by the owners manual recommendations and here is what they say:"BMW continously approves specific oils after confirming their suitability for use in it's vehicles with extensive testing." Page 120
Also in the service and warranty information book on page 4 it states:
"At the time of this printing of this booklet,the following oils are strongly recommended and approved by BMW"
BMW HP 5W30
M1 5W30
M1 5W40
This info applies to all 06 E90's sold here in the US.
I like to use thinnest group 4 oil I can use.
It will result in better fuel economy and less wear.
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