Just a word of caution on the dreaded oil cap...make sure that damn thing is on really snug. I think that the metal spring tabs tend to wear out and become weaker after multiple removals.
I just changed the oil in my '11 E90 M3 (with no issues during the change) and had a major blowout while was driving around the neighborhood to get a reading. Under pressure, the oil cap blew off, spewing fresh oil all over my engine bay and out the front of the car. I couldn't believe it. How does BMW produce such a terribly designed oil cap?? I've had the all-to-common cap leaking issues in the past, but not a complete blowout!
Lessons learned: 1)make sure cap is very tight and secure, and not old. 2)don't drive around to get a quicker oil level reading. Luckily I wasn't too far from home so I put another liter in and limped home (about 1.5 miles).
All said and done I lost about 1.5 liters I think. Could have been a lot worse. But cleaning this up was a nightmare!
Imagine coming around the front of your M and seeing this:
