Oil has always been a top topic. Owning numerous Harleys, the oil topic was no different, what brand, what weight etc. After reading all I could find, I decided to use Mobil one V-twin in all my Harleys. I now own two victories, and on this forum, oil is still very talked about. Harleys use 20-50, and Victories use 20-40. Again, I read a lot about what to use in a Victory, and still not sure what to use. My question is, do or should I use 20-40, or can I use 20-50, like the mobil v-twin. Don't have a dealer close to me, so I would like to use the mobil 1. Some say the victory was designed to use 20-40, others say 20-50 is fine. So, yes or no on the mobil v-twin?