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I like liquimoly as a brand myself.. I use the 0w-20 for the m35i while it is under "warranty" because that's what our local BMW uses.. just in case so oils don't get mixed up. I have been using 0w-40 for my cars for a while and no issues.. the 2016 X1 has been using it for about 2 years now, and I haven't see anything good nor bad with how the car runs or gas mileage...
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