i would do trans and diff fluid,and probably engine and cabin air filters,every 30k miles.i would also do the coolant if it's original.i plan to do that at least every 4 years.
you're also getting close to time for spark plugs.the manual says 37k miles for them,not under cbs,but mine were changed for the previous owner at 30k.
you're right,there isn't much guidance for reasonable maintenance from bmw,i've worked up a schedule on my own taking advice from mike miller's lifetime maintenance schedule,and a friend who is a bmw master tech.i hope to keep my car a long time,and plan to maintain it accordingly.
~ TRAFFIC LAWYER IN CENTRAL NC ~
2OO8 E90 M3 /// INTERLAGOS BLUE w/BAMBOO BEIGE, CARBON LEATHER / 6MT / 19" 220M FORGED WHEELS / PREMIUM / MOONROOF / IPOD / BSW SPEAKERS
~EVERYTHING IN MODERATION,INCLUDING MODERATION ~
Last edited by robbiedawg; 12-05-2012 at 09:24 PM.