As many know I run the T4 and T6 mixed 50/50 after seeing another very trusted Vog member doing so and I have had great results. I thank canadian paul aka pauljp as I was only following his direction. After learning that most semi synthetic oils are not mixed 50/50 ( thanks slick for that info ) I am going to experiment again next oil change to the 75/25 ratio like slickvic purposes above, I have ran that ratio before but do not recall the clutches feel. The manual states to use a syn blend so that’s what I use in mine. Love this machine, it is a forever bike, I do / always will have others but the xct will always be in the stable as our 2 up traveling bike and grocery go getter, I love riding it solo too