I just picked up a preowned Hydro Pro 28 and am giving it a tune up before we get our first snow South of Boston. I changed the oil (Mobil 1 5W30, and put in a new platinum Champion spark plug. Now I'm thinking about having a spare set of belts on hand, just in case. Is there any reason not to go with aftermarket? A set of 2 Stens direct replacement impeller belts is $26 versus $50 for OEM. The Ariens traction belt is only $18, so I'd go that way, but if I can save $24 and the quality is comparable, why not?