Under the motor, tucked up inside the crankcase.
Look here for precise instructions: http://pokiespages.com/pokie/oil.htm
adjust the throttle
Under the right side chrome air cleaner cover.
The r1200c is one of the few bmw's made where the seat does not unlatch. It is bolted on. U may have remove the saddlebags(if any) and or the side panels under the fuel tank. these pull off from the bottom. .
best oil is 5w30
there are no factory seat heaters on the R1200C. On the dresser R1200CL and CLC, there is, and that is controlled by a rocker switch on the handlebar. The passenger seat heater should have a rocker either on the side of the seat or under the right edge of the seat. off, low, and high. If it is a R1200C, Corbin made a heated seat for this and there is a simple on off switch.
7 QUARTS OF SYNTHETIC OIL.
BMW R1200C fuel filters are located inside the fuel tank mounted with the fuel pump assembly. The fuel must be completely drained out the tank and the entire tank must be removed off the bike to access the bolts under the fuel tank. It's made of metal and looks like a typical fuel filter. For such a job it's best to just replace the fuel filter while it's disassembled.
BMW recommends 20W-50 oil for R bikes. No synthetic until after 10K miles.
The original comes with a backrest(97/98) very comfortable and the back rest can be moved to the rear to support the passenger seat. Practical
No dipstick. To check oil correctly, engine has to be at operating temp. There is a thermostat for the oil colors, so ride the bike 15 minutes or so, sit the bike straight up and down, check the oil level Window on the left front of the engine. Oil shoud be approx. half way up the bullseye mark. the total capacity for te sight glass is 6oz.