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I have a ktm 250 sx-f (2006)... previous owner put in 15W- 40 SEMI synthetic oil into the bike, i know for a fact it should be fully synthetic.
I have some Mobil 15W-50 motorsport fully synthetic oil in the garage and was going to use that.
Will that be ok or shall i keep the current oil in it?

Many thanks
Tom
 

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I would not use either.

The 250F needs thin oil to lessen the chance of crushing the oil filter when the oil is cold.

10W50 is recommended for summer use, 5W40 for winter use.

Whatever oil you use, dont rev it till the radiators are hot.
 
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