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I bought BMW fluid. Changed mine at 40k along with brake, diff and PS fluid. Still need to do coolant. I used BMW diff, PS and trans fluid.
I use Redline in my E36M3. Have tried D4ATF and MTL and did not notice any difference, but the MTL is in there now. Also tried Royal Purple Synchromax and did not notice any difference. I may use Redline next time on the E90M3, but that won't be for several years at the rate I drive.
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