10W40 was the best all year around oil. 20W50 is just too thick for cold temps. At least thats what the dealership said. Also its what I gathered from that chart in the manual. :-\
the engine seals and components has to wear in properly the additives in synthetic won't allow it to do it properly. I myself will not run synthetic in a bike that it doesn't call for synthetic oil just my input.
Viper Motorcycles which makes the most powerful production V-Twin in the world (152 cu. in.) ships with Mobil1 in its gizzard. Just sayin!
I know a lot of you guys know about the Amsoil white paper, so here is the link to the current edition. It is pretty technical but still readable and understandable.
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