Changed oil at 6500

2005 model. The sump drains were horizonal hex plugs, no crush washers, just a little sealant on the threads. The tank drain, one big allen head just past 2 left side. The sump took a while to drain completely. It took 5 liters to fill and I used the factory stuff to keep the warrenty . Walmart does sell the 4t syn oil for motorcycles 20W50. This is what a harley uses for air cooling. It doesn't say racing but I bet the differences are small. It went for $7.59 quart. What a difference in the way the clutch feels and the clanking is somewhat quiet.

Been studying on that have you? Don't blame you and I am so sorry you are not having the same experience as the rest of us.