:driving I called the number in the owners manual
about motor oil. They told me that the only oil BMW
approves other than there's is 5W30 Castrol Syntec
Mobil 1 and Valvoline SynPower. Bmw Synthetic oil
is made by Castrol anyway.
although i do not believe their reasoning, please use ONLY what they recommend.
m3 engines were blowing up and they blamed it on oil (WAHAHAHA!!). hence: if anything happens to your car at least they cannot claim it was the "unapproved" oil that caused it.
out of the three they recommend: mobil 1 has almost no ash, castrol has a ton. castrol also has some metal compounds which presumably prevent scoring at high rpm. none of this matters much in real life...