I had an 850i, the bloke I bought it from had not really been using it. I used at as my daily driver. First week the rear steer hydronic pipe broke, that was an expensive fix. Then in the summer she started to heat up, not to bother I thought as they have an extra auxiliary electric fan mounted in front of the rad in the nose cone, she still kept getting hotter, then a massive bang and it was like a steam train. Popped the bonnet, rad exploded, expansion tank exploded......strange I thought so I removed the cover for the aux fan............It had been removed! Not that I would have ever checked.............another expensive fix! Kept it a year and used it as my business use vehicle, all good. You never see them, until you buy one. Driving down the M25 one morning I saw one owing down the third lane, he flashed his lights, then another came down lane one. We were like a red arrows formation! What a smooth engine that 5 litre v12 was. And 80s supercar technology, scary!