You are going to love it. Yeah, you can tell a difference when changing oil. Spark plugs, maybe if it's burning oil or they are cracked. But, I'm just on my 3rd set of plugs. Not hard on spark plugs or particular about them. Tractor doesn't seem to notice a difference when I change them last time. Fuel filter, air cleaner, and especially the radiator/screen do matter. Just don't rely on the stupid little cylinder on top to tell when to change/clean the air filter. Do it religiously at least a couple of times a year. If you keep it clean, you won't have to buy a new one for a long time (and that cartridge is pricey).