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I would buy a BMW new enough to have Brembo brakes and hardened valve seats. Post 1983? I would love to have a '95 "last of the airheads."
IMG_3393 by jay_snyder67, on Flickr
Almost forgot, my last Beemer, an '05 R1200RT used a considerable amount of oil, even after 30,000 miles! They all do, that is part of the deal.
Actually, they all don't.Sorry to hear about your bad experience, but glad you found something more to your liking.
The thing to realize about Airhead BMWs is that you shouldn't try to keep oil at FULL level - they will all dispose of some oil to get to their happy level and then pretty well stay there. True of all mine - '83 R100CS, '84 R100RS, and '60 R60/2. Same is true of my Lycoming in the Grumman BTW. Something about air cooled horizontally opposed engines? Chuck?