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0W-40 motor oil for bmw z4 4 cylinder?
i've had a few auto shops tell me for my 5 series and z4 to NOT use 5w-40 but rather to use 0w-40. i live in LA in mild weather. can anyone confirm this?
Last edited by cruisingdownthestreet; 12-13-2016 at 05:38 PM..
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