If the clutch has to slip cause of the oil... it will definetly happen within 15 miles pipe
I noticed better shifting with the full syn Rotella T as well (versus plain old Suzuki dino oil which came in the bike new).I could swear they are quieter and shift better, but it could be the placebo effect.
I'll use the Rotella again.
Thanks for the tip
speaking of wasting good synthetic oil. I had just gotten my turbo setup together and I had a leak in the oil return line so I ended up draining the 15-50 mobil1 out of it and tossing it. It had about 2 mi on the oil.That way you don't waste perfectly good syn oil...