Repsol synthetic. Get a good deal on it so I buy it. :ots of it. I am also using a Scotts oil filter, the kind you clean instead of replace.
(Was using Rotella T in my race bike and had two bearings go tits-up. It was a SV650 motor, rear cylinder, connecting rod bearing and journal scorched. Also had to replace a Kawi 636 shifting drum after the use of Rotella T on the race track.)