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Amsoil SAE60 Synthetic V-Twin Motorcycle Oil

4.6K views 87 replies 13 participants last post by  slickvic  
I think I read on here (or maybe heard in one of the vids), that the oil passages in Vics are smaller, so thicker oil could not circulate as well and hence the 20/40 recommendation. I run 20/50, but also live in a hot climate and it seems to have helped with the heat in the middle of summer when temps get well over 100° F
 
IIRC you went with the 505 because the 504 HPT weren’t available, right @Meisen ? Those are what historically have been suggested for the BB.