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      04-05-2021, 11:22 AM   #1
f82_boi
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50k service

My car is currently almost at 50k I already plan on swapping out spark plugs and changing my oil, but would you guys recommend transmission fluid and differential fluid changed?

Year: 2017
Model: M4 Comp
Miles: 47k
Mods: Stage 2 BM3 E30, Catless downpipes, charge pipes
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      04-05-2021, 01:12 PM   #2
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Quote:
Originally Posted by f82_boi View Post
My car is currently almost at 50k I already plan on swapping out spark plugs and changing my oil, but would you guys recommend transmission fluid and differential fluid changed?

Year: 2017
Model: M4 Comp
Miles: 47k
Mods: Stage 2 BM3 E30, Catless downpipes, charge pipes
Differential fluid yes, and transmission fluid no, I will wait tell maybe 80 to 100k for that.
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      04-05-2021, 02:37 PM   #3
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Quote:
Originally Posted by f82_boi View Post
My car is currently almost at 50k I already plan on swapping out spark plugs and changing my oil, but would you guys recommend transmission fluid and differential fluid changed?

Year: 2017
Model: M4 Comp
Miles: 47k
Mods: Stage 2 BM3 E30, Catless downpipes, charge pipes
Are you MT? You should just change out the MT fluid and Diff fluid. Super easy and mine was really black when I changed my MT fluid at around 40k. MT requires 2 bottles and diff is around 1-2 bottles.

For DCT, not too sure but I do know its a bit more involved, but still DIYable.
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      04-05-2021, 02:41 PM   #4
f82_boi
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Quote:
Originally Posted by jpy1980 View Post
Are you MT? You should just change out the MT fluid and Diff fluid. Super easy and mine was really black when I changed my MT fluid at around 40k. MT requires 2 bottles and diff is around 1-2 bottles.

For DCT, not too sure but I do know its a bit more involved, but still DIYable.


No... mine is DCT unfortunately
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      04-05-2021, 02:45 PM   #5
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Quote:
Originally Posted by f82_boi View Post
No... mine is DCT unfortunately
See this thread: https://f80.bimmerpost.com/forums/sh....php?t=1763835

I guess for now, just do the diff. Literally takes like 5 mins. Remember to take off the fill bolt first!
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      04-05-2021, 05:15 PM   #6
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DCT fluid does not need to be changed. I did mine at 77k and the fluid looked pretty clean. I also sent a sample to Blackstone and the oil still had plenty of life left. Generally you're concerned about how acidic the oil is at that age, but even that was good (TAN was low). I like to rely on the data rather than a label that says lifetime, but the data shows that this may be lifetime.
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      04-07-2021, 02:15 PM   #7
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Quote:
Originally Posted by f82_boi View Post
My car is currently almost at 50k I already plan on swapping out spark plugs and changing my oil, but would you guys recommend transmission fluid and differential fluid changed?

Year: 2017
Model: M4 Comp
Miles: 47k
Mods: Stage 2 BM3 E30, Catless downpipes, charge pipes
Diff for sure. Transmission probably hold off. Also do your intake and cabin air filter.
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      06-11-2021, 05:13 PM   #8
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When should transmission fluid be done?
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