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      09-23-2016, 12:18 PM   #6
Carbon.F30
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Drives: 2014 BMW 335xi (M-Sport)
Join Date: Jun 2016
Location: Toronto

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I saw the 0W40 in the OM and that's what I'm running right now. Seems to be pretty fuel efficient, and to my understanding they also call it BMW longlife 01 on the label. So here are the next questions:

Would it be okay to mix different oil? Let's say for argument's sake your dealer put 0w40 and you top up with 5w30 which is listed on the OM, would that matter at all?

Would it be better to have a thinner oil, or a thicker oil?

Also, would the oil viscosity change based on seasons or use the same year round? Should we be switching our oil to thicker/thinner ones through the winter vs. Summer?
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