Do the plugs foul? Have you checked for blow by? Any smoke coming from exhaust? I've got the head off my '89 300e(156K miles), had fairly significant oil consumption. The valve guides were shot, the valve stem seals were as brittle as bakelite. Sounds like valve job or at least valve seals absent any other problems.
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Jeff L
1987 300e
1989 300e
1987 BMW 325
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