Hey guys, just bought me a new toy-- a Kawasaki Brute Force 650 4x4 ATV. This has a 633cc watercooled V Twin engine and calls for 10w-40 (year around) or 20w-50 (summer) that meets JASO MA. It has the CVT transmission, but apparently there is a starter cluth that doesn't like FMs very well, so I can't use a highly friction modified oil in it. I am looking for a good synthetic oil to use in it, probably running thicker in warm weather and thinner in winter. Thanks.