Seasonal service is a summarizing at the start of the season and winterizing at the end of it. Summarzing it basically consists of checking everything inside and de-winterizing it(pump out antifreeze in cooling system), checking plugs/hoses, hooking battery back up, and possibly changing out fuel(correct me if im wrong on this last point). Greasing the bearings in the trailer axel is a good idea as well as checking the tire pressure for the trailer. Winterizing basically putting antifreeze in cooling system, disconnecting battery, and stabilizing fuel. Keep in mind this is for my 2 stroke, so not all of these may apply if you have a different engine. I was just trying to give you a heads up on the season things service places will do. hope this helps