Quote:
Originally Posted by techman1
Lifetime fill in our 2004 BMW 325. Reverse and drive started delaying when selected. At 90k.
Bought a kit based on what type of trans (GM made trans for some!) and it came with proper fluid, filter, gasket and all new bolts. All delay gone, shifted like new. Was a little worried, believed the hype "Only BMW can service the trans. They refused to change the fluid, so no options.
Filled per instructions, car is now 170k, maybe time for another change. Still shifts like new.
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Had a similar situation with my BMW 525i with 128K. Spoke to a very reliable and experienced transmission mechanic who services BMW, Mercedes, Volvo, etc. His advice was as mentioned by a few in this thread. Basically, if the fluid is
changed regularly at, say, 50-60K, there should be no problems. Once you get around 100K on the "lifetime" fluids, changing should be done with only
partial fluid replacement. New fluid has much stronger "cleaning" chemicals that older fluid and to introduce that to a well used system often results in failures within the near future.