Hi All - I am new to ATV's and recently purchased a 2018 700 SE. I went to the dealer to pickup oil for the 20 hour maintenance and was informed that Yamaha was going to 15W50 Synthetic. It is not listed in the manual so I wanted to check and see if you had any info. I know it is probably better than the 10W40, however, I like to follow the book. Most of my use will be occasional plowing snow (above 20 degrees) and working around the yard. Thanks.