I'm sure many have asked the same question, but here it is again. I just bought a 2008 Warrior and the dealership is offerring me an extended warranty for $700 or the 3 year extended warranty and service plan to cover parts, labor, tax for service for that 3 year period. I hear you have to adjust valves periodically etc. Is it worth the extra money or is it fairly simple and much cheaper to do it myself? And another dealership offered the warranty for $590.