how much oil consumption is normal?
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Sounds like my wife's old Mazda 626 - it needed valve seals, wouldn't leak in the carport, but would constantly need oil. Only smoked bad after it had sat overnight (burned off whatever had gotten past the valves) then ran normally. It had to be burning what ever else was getting past as it ran, but wasn't enough to notice smoke. Car practically changed its own oil. It seemed to do better after a Lucas treatment every thousand miles or so. Dunno if that stuff is really recommended for our bikes though.