So, i have this issue too. Brought car into the Ottawa BMW dealership today for regular oil change and they said they did a 20 point check on the car and i have slight crack in the gasket and a small leak that should be looked at soon. Told it wasn't too serious yet but needs looked at and fixed in near future. They gave me a quote of:
Labor. 414.20 (3.8hours)
+tax = 507.01 total (canadian$).
Car is an 06 325xi with 77,000 km.
I thought the quote was high till i saw this thread!
Will call my independent bmw mechanic tomorrow and see what they quote for it... Wish i had the guts to try it myself!