nologic, go over to any BMW dealer, they have 15W50 that meets all of our specs (as I mentioned in my other post), and is only $8 a quart versus $12, then you have that extra peace of mind. Another possibility is to order Motorex oil online from:
MOTOREX USA
Chuck Ramage
1932 Eastman Ave., Suite #107
93003 Ventura, California
Tel: 001 805 658 0900
Fax: 001 805 658 09 10
e-mail: motorexusa@juno.com

They have several 15W50's, one for about $7 a quart, one for $8 a quart and one for $12 a quart. All meet our requirements, so you should be fine to go for the $7/quart stuff. I'm going to give the $8/quart stuff a try next time around. Running the Beemer oil now (it's actually from Spectro), so far, so good!