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Is it important to use just BMW's synthetic motor oil or can I use other brands such as Mobil or Castrol? Same question for other fluid like coolant.
 

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: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.
 

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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...

peter
 
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