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oil getting by the rings causes white smoke and oil dripping out of the tailpipe.
Engine oil, KTM recommends Motorex ATF Super (Dexron II Gear Oil) Premix, KTM recommends Motorex 2T.
hw much gearbox oil do you put in your ktm 525
How much engine oil do you put in a ktm 85
When oil comes out of the tailpipe it's time to see your machanic. the Piston Rings are worn, and need to be replaced.
what oil is used in a ktm 65
Burning oil
You can find that info , as well as a lot more, here: http://motocross.transworld.net/2003/07/09/2004-ktm-125-sx-200-sx-250-sx-and-525-sx/
The engine oil capacity for a 2010 KTM 250 XCF-W is 0.75L. It is also stated that the best oil to use for the 2010 KTM 250 XCF-W is the 10W-40 bike oil.
You are burning oil.
KTM recommends Motorex ATF Super (Dexron II Gear Oil).
KTM recommends Motorex Top Speed 4T 15W50