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According to BMW, the 6 speed manual gearbox uses a lifetime oil. What this means is that there is no need to change this oil ever.My transmission was not feeling so hot after 80,000 miles and a good number of track days. I picked up two quarts of Royal Purple Synchromax fluid in their Figure 2 Place the drain pan under the transmission and remove the fluid drain plug (green arrow). Be sure your drain pan has a capacity of at least four liters