@LindaWisner
I only have general maintenance suggestions that you probably already know.
From what I recall from my snow blowing days in Minnesota, gas with the least ethanol and deoxygenated (usually 89 or above), and regular oil changes made the engines last longer.
As with everything, check with the manufacturer's recommendations. This is just stuff I recall. I live in California where I need a snow blower as much as you need ice cubes.