KTM is not the only company by any means that specifies 10w-60 oil. As is true with any motor, and especially this one, being a big piston with high compression, the majority of the wear happens before the engine reaches operating temp, so the thinner the oil at startup the better. In other words, a 0w oil is best for any engine in the world at
1. Compress the tensioner all the way down, at which point it will recoil and extend fully. This squeezes some oil out of it and also checks that it functions properly. 2. Compress the tensioner again, almost all the way this time, leaving only 3mm of the piston extended out of the tensioner body. K&N automotive oil filters are designed to work with all grades of synthetic, conventional and blended motor oils. 2019 KTM 690 Duke 690 oil filter. $10.99. KN-651. Add to Cart. 2019 KTM 690 Duke 690 oil filter. $10.99. KN-155. Add to Cart.