Mystik JT8 Semi Syn 15/50
Why? Its the only oil available that I know of with a Ch4/Cj4 rating required by Harley for my bike, other then their oil and much more expensive Amsoil and Red Line.
Other reason why is, having run it now for almost 3 OCI fills and a couple UOAs plus one VOA, all posted here I cant find a reason not to use it. Engine runs quiet, good wear numbers, no unpleasant tapping or noise, and again, fills Harleys requirements, I guess its a no brainer.
$34 for a 2 gallon container delivered to my door makes it more attractive but the reason is it meets Harleys specs.
There is a little blind faith, that Citgo, maker of Mystik is being honest about its rating, being, like many oils, they just claim to meet CJ4 specs, not actual API certified.