Therefore, it is a good idea to service your fluid every 60, 000 miles. The BMW E90 manual transmission fluid is filled at the factory with lifetime fluid ( green arrow). The 8HP transmission is so good from a performance standpoint that it is used in the BMW M235iR race car in place of a manual, dual. Bmw manual transmission fluid change cost. Labor costs are estimated between $ 111 and $ 142 while parts are priced at $ 73.Jan 12, · BMW 8HP Transmission Fluid Change in Just 4 Minutes FCP Euro. Now, for most cars, the average cost of transmission flush is usually between $ 120 and $ 450, depending on labor costs and how much is the transmission fluid that’ s required, among other things. If you' re unsure of the last service, replace the fluid as soon as possible. Transmission Fluid Change Cost The average cost for a BMW 328i transmission fluid change is between $ 184 and $ 215.