Hi! Ive always used 30 weight in all my yard equipment in the past but i have just purchased a 1997 345 John Deere with the 18hp liquid cooled Kawasaki engine, i was wanting to try somthing different with this one though. I was thinking valvoline synthetic blend(blue Bottle) and a wix or purolator filter. this may seem like a silly question but i just wanted to make sure with you guys. Thanks!