Originally Posted by Blackhawk36
One thing that is great about the Bentley manual is that it is updated with "field observations" in the front of the book. I think the shortened oil change interval reflects that. BMW states the longer interval because they pay for it up to 50K miles, not enought time to cause any problems. Over the longer time it has caused some problems for some posters. Like CBAD335 says...Search. You will find tons.
Just FYI: BMW service is not included in Europe. We have the same oil service intervals here. Since new, I have been paying for my oil changes (250 Euros a pop). Rather than wait once per year or 18K miles, I do it every 6 months (10K miles for me).