Fully synthetic after 1500, Amsoil, Motul, just make sure it is M/C specific. I don't think you really need to change weights based on season for the modern motorcycle engine, but I guess you can if ya want, lots of people do. Maybe running across the Sahara during the Dakar I would change weights. Maybe.
Recycled fish oil from mom and pop sushi bars but only those that are on the north side of east-west streets or on the west side of of north-south streets. Don't even think about chain sushi bars (they are not really Japanese and therefore don't meet JASO MA, obviously) and only pick it up on Fridays. All other days the oil isn't as good.
Don't go to synthetic or semi-synthetic until you're pretty sure the engine is broke in.
I've had good luck with Mobil 1 15W-50 car oil with all my other bikes, but might not use it in this one.
Kawasaki only recommends 10W-40 for temps up 104 degreesF. It exceeds that on occasion here in Texas during the summer, and I've ridden in the desert southwest in temps over 120degreesF. I'd only use 10W-40 if you're riding in temps below freezing. The 20W-50 is good down to 32degreesF.
Mobil 1 4T, fully synthetic, for bikes with oil immersed clutches.
I am sure the Mobil 1 car oil will be ok but I use the bike stuff.
I haven't had the Versys long enough to find out but on my previous bike I could extend the oil-change intervals by 2 times and the oil still came out cleaner than with normal at half the miles. I used to change at half the recommended interval with normal oil but I extended it to the recommended with Mobil 1.
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