chachaanteng
Well-Known Member
I’m also approaching my break in service soon. I’m doing my rear diff as well. My buddy that works at BMW service said the break in service for M cars include rear diff. He showed me the oil from one of the car he did recently and it had metal shavings in it… I also considered doing the transmission as well but we’ll see. I bought the 5W-30 kit from FCPEuro. If you haven’t used it before, their lifetime replacement program is great
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