Anybody out there know what is the best motor oil for a Ducati Monster V-Twin (Air-cooled)? It will be used in extreme hot weather. This V-Twin motor gets extremely hot in heavy traffic. Hot enough to be extremely uncomfortable for my feet! I was thinking in terms of something like Castrol GTX 20w-50 or Castrol HD-40. That's what the Tower Gear Ducati fans of the 1970's used to ensure a long life for their valve trains and big-end bearings. I'd really appreciate any helpful opinions.