Amsoil has several oils that should work. Some of their European formulas are certified to LL-04 and Longlife-04 which cover diesel service in BMW engines. You can look it up on their site by plugging in the make and year on Amsoils website.Any idea whether or not Amsoil has any diesel BMW information?
I use the BMW oil but service it myself but ran Amsoil on my 2002 Road King and really liked it. Never thought of running it in the BMW but I would if the information supports it.
Please reach out if any of you know an Amsoil dude.
I've been running Amsoil in my stuff exclusively for close to 30 years now.