One thing to remember is to first put oil into the oil filter. Just pour a little in and once it gets to the top, stop and let it settle. do this three times. This was taught to me by a big car buff who held the land speed record set on the salt flats of utah in a bmw that looked like a rocket (Steven Pieper). he also raced nascar for a time, then a cushy job w/ bmw test driving cars on tracks. I don't remember exactly the reason, but has something to do when you first fire up the engine after you change the oil. They dont' always do this at garage's but my buddy who worked for VW also said he knew of this and did this as well.