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Dear Dackel:
I come across this post again as I have been talking again with my dealer because I want things to straight up.
They are using on the M3 the Castrol 10w-60. I was reading about it and realize that it is labeled as an oil that has exclusive approval for BMW M models. The local service manager answered me that they don't use this oil on the 1M as it comes with an N lettered engine and not an S one.
Are they correct? I mean, I know my car has the N54 engine, but Should I use this same oil?
Should I order the Castrol EDGE 0W-40 A3/B4?
On the fuels aspect, I don't really know about the sulfur they contain, but anyway I change the Oils very frequently (< 5000kms).
Thanks in advance.
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