My parents bought a 610 Mule for ease of getting on and off after riding my old 300 Fourtrax for years. The Mule only holds 1.5 qt of oil with a filter change and specs for 250 hour changes. The dealer changed the oil at 10 hours and I changed it at 90 using a factory filter and oil. I feel the 250 hours is too long for only 1.5 qts. of dino oil in a hard working aircooled. The manual calls for dino 10w-40 ja spec, but it is not a wet clutch. What do you guys feel I need to use? I run mobil 1 motorcycle and 0w-40 amsoil in my hondas (wet clutches). How about these or a quality synthetic car oil?