Seriously, if you want to change all the vital fluids, do the oil every5 months of 5k miles unless you drive very very very hard (then do it 3k), brake and coolant every 1-2 years. BMW has "lifetime tranny fluid" and there often reports of people killing their tranny after doing a flush/fill. You can, but you should repeat the process in another month, as the new fluid is said to eat away at and loosens old gunk. Differential fluid is another "lifetime" but you can change it if you want. I've never heard any ill effects of that.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>
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