Just bought a mint 2005 R1200RT with 13,500 miles. One-owner, dealer serviced, and in immaculate condition with the Level 2 option package plus quite a few very nice owner-installed farkles. It had the 12,000 mile service done at the dealer but that was in spring 2010. I always like to start out on a level field so I've changed the oil/filter and the transmission oil. The brake and clutch fluids are next. Being an '05 model, it does not have a drain plug on the rear drive which contains the "permanent " oil. As we know, BMW has since backed off their "permanent" position and installed drain plugs on the rear drives of models '07 (I believe) and on. In order to drain the rear drive of the '05's and '06's, one must dis-engage the rear drive and tip it downward 90 degrees so the oil can run out the filler hole. There's a lot of internet info on that procedure but I'm wondering if anyone has had any success actually sucking the rear drive oil out of the filler hole itself while leaving the rear end intact. That may/may not be as good as actually draining the oil in terms of getting any/all crud out. On the other hand, if it is done while the oil is still hot, perhaps it doesn't matter. I've been doing it for decades on my old Volvos and their differentials are still sound after hundreds of thousands of miles.