@beewang - I've used the extraction method on my M3, prior to getting access to a lift. I like inspecting the underbody regularly, and also there is a chance that extraction doesn't get quite as much out oil out as does gravity.
But sounds like we agree on larger points -- no need to go to dealer for simple stuff like this, and no need to pay $16/l for Castrol TWS!
I LIKE OLDER BMWS, PLEASE HELP ME
Fern Green 99 M3
, Conforti Shark Software, Conforti CAI, Dinan Exhaust. Stamped LTWs, 235x40 square, OE Hella heads, ///M
Pedal Kit, Clear Corners, OEM Rear Spoiler, CD43 stereo. MRegistry listing here
Le Mans 2002 M5
, Black/Titanium, Rogue SSK, Dinan exhaust, PSS9 coilovers, Euro rotors, iPod integration. MRegistry listing here