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Not really. Just drain what you've got and refill with the good stuff. I don't recommend just adding more synthetic to the conventional you already have in there. It wouldn't hurt anything, but you wouldn't get the full value of synthetic. You don't have to have a special filter, so just go with what you've always used there. We do have the 10W-40 Synthetic ATV/UTV oil https://www.amsoil.com/shop/by-product/motor-oil/atv-and-utv/10w-40-synthetic-atv-utv-motor-oil/?code=auv40qt-ea&zo=5614636 But there is also the Formula 4-Stroke Power Sports Synthetic for those ATV racers who push things a little harder. https://www.amsoil.com/shop/by-product/motor-oil/atv-and-utv/formula-4-stroke-powersports-0w-40/?code=affqt-ea&zo=5614636 But wait! There's Synthetic ATV/UTV Transmission & Differential Fluid too! https://www.amsoil.com/shop/by-product/transmission-fluid/atv-and-utv/synthetic-atv-utv-transmission-and-differential-fluid/?code=audtqt-ea&zo=5614636 There's a lookup feature on the Amsoil website that helps you figure out what you need for your particular ride at: https://www.amsoil.com/lookup/atv/?zo=5614636 Feel free to holler at me if you have any questions.