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I would bet that everyone here with an X, and other cars/m'cycles,
uses synthetic oil. Many use a syn in power steering, transmission,
transfer case, etc. For engine oil, see litany of threads on opins
and "favorites" if you are bored, but any quality brand synthetic, imo.
And, BMW rec'ds it...you need to cop a manual; surprised you did not
get one when you bought the car.
GL,mD
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