I finally got back to the dealer and there is no bulletin or service notice. The service manager said they have the BMW servie program which, for any given service interval, details
the parts, chemicals and labor. He said about 2 months ago they noticed that BMW had changed, for camheads only, the oil from dino to full synthetic. That's what they are now using but he said no issue with using what the owner manual prescribes.
I will use the synthetic to see if there is any significant oil useage. So far at 6000 total miles, there has been some oil use but not significant.