Ok, got two quads, Suzuki Vinson 500 is a 2002, has 857 total miles. Yamaha Kodiak 400 is a 2004, has 784 miles. Lots of around the farm use year round. Use from neg 20F to mid 90's F. Wife put euro 5w40 quaker state synthetic in her kodiak in April, no issues. We went swamping in our lower land...