DON'T TRY THIS AT HOME - TRAINED PROFESSIONALS ONLY!
Never realized that an oil change could be such a challenge. The BMW engine fitted to a Chang frame, although a match - it does make for a maintenance nightmare.
Sidecar removed along with the footpegs, followed by both exhaust headers. Front engine bolts removed, back bolts loosened. Entire bike raised, then the engine is lowered four inches with a tire jack to gain access to the filter cover. Oil is then drained by rocking back and forth. Reverse the assembly process, hoping that left over parts are not discovered. Start to finish - about a one hour job, by a tech that has done it a hundred times.
Lucky that it only has to be done every 10,000 Kilometers.