That could be true if you wait until 100k mi. 50k is the right mileage to service your AT if you plan to keep the car past 100k. Just had my AT serviced at 53k cuz I plan to keep the car another 10 yrs. Change the pan w/integrated filter with you drain/fill the fluid.
2007 E90 335i, TiAg, 6AT, ZPP, ZSP, ZCW, 6FL, HD
Quaife lsd, ETS fmic, GIAC s/w, Dinan intake/exhaust/oc, Koni/M3 susp, Apex Arc 8, Mich PSS