$67 for Mobil1 isn't bad compared to the $330 I once paid for an oil change for my BMW using Castrol TWS 10w60, the only specified oil for the S54 motor (@ over $10 a bottle). If you really want to save $, get yourself a Mityvac 7201 fluid evacuator/dispenser, also known as a top-sider. It is pretty much ready to use right out of the box, but I recommend getting some small diameter hose clamps on the hose couplings to keep the hoses from coming undone during use. You'll want to cut a little notch at the tip of the tube that goes into the dipstick tube so that when the tube hits the bottom of the pan it won't get full suction and stop pulling up oil.
1. Just before performing the oil change, drive the car 10-20 minutes before doing the oil change to get the oil well circulated and hot. Idling is not good enough, drive it.
2. Park on level ground, shut the engine off. Open the oil cap.
3. Remove dipstick and stick the Mityvac's tube down the dipstick tube as far down as it'll go. Make sure the valve switch is on evac, pump the handle 10 to 15 times and it'll start pulling oil out. Don't worry about not pulling out any particles or sediments changing oil this way. The job of the oil filter is to catch these particles, as long as you always change the filter with every oil change, you are fine. If you are finding metal particles in your oil and oil pan, you've got greater issues than a $67 oil change. There are some engineers on the BMW board who have done oil changes this way for many years with no issues. Blackstone Laboratories oil analysis results have confirmed it as well.
4. The Mityvac has volume markers on it, you can see how much oil you've pulled out. You may need to pump it a few more times in the process to pull all of the oil out. Once done, it should be the same amount the service manual indicates to add for oil changes.
5. Install a new filter.
6. Add new oil. Let it run for a little, then double check dipstick level etc.
7. Every few oil changes or so check the drainage plug for seepage, if there are any, replace the crush washer. Chances are you won't find any.
Clean up is fairly simple. You can use the dispense setting to dispense oil into a container to take to a recycling station or you can pour it out the top. Remove the hoses and blast brake cleaner into it to clean out any oil in them. Hang them up and put rags under the tips and let it drip out. For the Mityvac itself, spray brake cleaner into it, slosh it around and dump it out, repeat a few times until you think it's clean enough. Brake cleaner fluid evaporates pretty quickly so you can just leave the Mityvac uncorked (rubber stopper) and air out. Do not store the Mityvac corked. Oil contains rubber swelling agents. If you leave the stopper in, it may swell and become difficult to remove.
You can get teh 7201 from Amazon
http://www.amazon.com/Mityvac-...r=8-1Shop around online, it may be cheaper elsewhere. Price fluctuates from time to time.