I've seen it done both ways in changing the oil in BMWs. Guru Kris L replaces the oil before changing out the filter. I change the filter as the oil is being drained out thus saving time. The whole affair takes me 15 minutes, while those who use an oil extractor takes much longer, enough time for a few beers as you can see in his video.
Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid. Albert Einstein
Swim upstream. Go the other way. Ignore the conventional wisdom. If everybody is doing it one way, there’s a good chance you can find your niche by going exactly in the opposite direction", Sam Walton.
Last edited by Dave 330i; 09-22-2012 at 08:34 AM.