Bought our X535d at 113k now at 148k has been very reliable. I replaced the glow plug module 1k ago as the only repair besides normal maintenance. The urea system has always shown MIL which is of no consequence to us as we do not have e-tests here and the system will soon be deleted and tuned out. I would not hesitate to buy another. BMW gasoline sixes have also been proven to be reliable as well. This is our 5th Bimmer.