Okay, the story. I was given a repairable write-off '88 GPX250 Full story is below. But I will jump to the problem and what I know: I have been trying to get the bike running after 4 years sitting idle. Carbs cleaned and fresh fuel, new fuel and vacuum lines and so forth. This question is about the current results I am getting: Oil colour started out milky. It is improving but not perfect after 5 flushes, 3 filters. Water level drops a little but doesn't seem to drop by any more than an inch in height from each fill (have not run the bike up to temp to get the coolant flowing fully yet). Oil level drops by 300ish mL after each fill but no sign of it on the ground or in the pipes/exhaust or carbies and each time I clean it there is less of this mysterious white smoke coming from around my engines exhaust ports. Other than that the bike responds to throttle very well, only needs half choke to start usually. And everything else is fine. I just can't get it to behave completely normally with regards to oil colour/level. As I said there is no sign of either a coolant or oil leak (internal or external). Is this unpredictable and non-uniform behaviour normal with a bike that has not been run for so long? Further explanation for those who may ask for details: Oil started out milky white, then deep vanilla, light vanilla, coffee brown and now caramel fudge coloured. I changed the oil out fresh after each 5-10 minutes and the filter was changed on the 1st, 3rd and fifth change (which is where i am at now I am asking). I knew the engine had been left adequate chance in the last 4 years to get condensation in it, side cover botls finger loose during intermittent attempts by the last owner to fix it. I have just swapped in the last of 3 filters I bought for the purpose of flushing it and am hesitant to waste any more oil before asking for ideas on if this is a good approach? Coolant level drops from full by about 1inch in height after any top up. This corresponds the the head height of my filler cap (with its overflow valve) height above the radiator itself (they are connected by about an 3inch long elbow joint that leaves the radiator horizontally and turns upwards to the cap. I cannot see any sign of coolant going anywhere, other than a few drips to the overflow when I start it once it is filled each time. Oil level seems to always go down about 300ml after a fill, with each run but there is no blue or white smoke coming out my exhaust since the first run (which may have been dust and crud from over the years. Didn't smell oily, foul stench like burning hair and dust but not oily) A lot of smoke came off the (largely dirt covered and part rusted) exhaust pipes, the cans are still pretty good though. This seems to have stopped with polishing them (the pipes) to a shiny steel and re-painting them with exhaust paint. Some white smoke (not oily though) comes from near the exhaust ports on the engine when it warms up after 5-10 minutes of running. As near as I can tell because with the mounting brackets for the exhaust I was a bit lazy cleaning them thoroughly as I was working on the pipes themselves. Most of the parts damaged had been pre-replaced, e.g. forks, steering stem and replacement frame. The guy who owned the bike (a friend of a friend, I got the bike and story 3rd hand) rides very hard and when I got the bike it hadn't been started for 3-4 years due to him being to lazy to replace the above parts and he'd whilst trying to tinker with it himself dumped the clutch and broken a few of the friction plates. 4 years on, having had the clutch cover left with the bolts only finger tight for the time, I get the bike. I started by cleaning the entire thing, repainted the frame and made sure it was structural sound. Took the clutch cover off, replaced the basket and every clutch part to be 100% sure I had not missed any damaged parts. All the gears and other parts are still good. Clutch sacrificed itself to save them Can anyone suggest if there is a problem I am missing or keep flushing the oil till it stays clean?... I can't see any sign of where it would be getting any more moisture from to go white and as said, it has been improving each time. With each change being run for 2-10 minutes (whenever the oil took a very obvious colour change and seemed to stop changing colour.