Bike is a 1985 Aspencade. Changed the oil for the first time today. Used Amsoil Synthetic 10W-40. I have read all kinds of posts about how Synthetic oil will help make the bike run more quiet, no lifter noise......., shifts easier, easier to find neutral. My main question, (and this is going to sound stupid) do you get all these results just by changing the engine oil? I dont understand, how the shifting can get better with just changing the engine oil. I was reading on the quart of Amsoil, that it is made for the tranny too? I am new to all this Goldwing stuff, so not sure how everything works.