Since my dealer charges $85 for an oil change on my '07 GT, I decided to do it myself. It's not the same as my R bikes, so here's how it's done:
First, put the bike on its centerstand, position an oil collection pan underneath and, using an 8mm hex remove the oil drain plug located between two exhaust pipes:
Next, remove the last screw in the fairing on the left side under the kick stand so that there is room to get to the oil filter:
Since the normal BMW filter removal tool won't fit in the space, I purchased this oil filter tool from a local auto parts store for about $8.00:
Using the tool, remove the old filter:
Here what it looks like when the filter is off. Since the filter is side mounted, some oil will drip on the nearby pipes.
Install the new filter. Since you won't be able to torque the filter, be careful to avoid over-tightening. And since you install the filter sideways, you can't, obviously, fill it with oil before installation.
Install the oil drain plug (32nm) using a new crush washer.
The GT has a dry sump tank that must be drained too. Remove the tube from the top of the tank by depressing the ring that holds it on:
Then insert an old foam earplug in the end of the tube so that when you snake the tube down for draining, the oil won't come out until you want it to.
Here's the bottom of the tube and its connection at the bottom of the dry sump tank:
With the tube positioned over the oil collection pan, remove the foam earplug from the tube and let the tank drain. It will take about 20 minutes.
Since the engine and the filter drain their oil in front of the center stand and the tube from the dry sump tank drains behind the center stand, I use two oil collection pans:
Snake the tube back to the top of the dry sump tank and reinstall.
Fill the oil tank with three quarts, then run the engine, then add the other .7 quart.