I have a Toro lawn mower that I obtained in 2009 and shelved in 2014. Last week the grass had simply gotten too tall for the battery-electric mower I purchased in 2015 (aggravating the situation: its batteries hadn't been fully charged) so I pulled out the Toro, filled it up with some gas that likely dated to 2014, and the thing fired right up as if I had just used it the week before.
In 1986 I bought a 15 year old Simplicity 7 horse power (briggs and stratton) snowblower. It was garaged and serviced every year until I got it. hehehe.
I kept it outside in the back yard, partially covered with a piece of plywood for another 25 years, when I gave it away to a friend.
In those 40 years, I had to replace the scraper bar, the side guides that it rides on (a couple of times), the gas tank that rusted out, and a bearing for the thrower impeller.
I never used stabil but I turned the fuel valve off, and ran the carb dry.
I'd service it every couple of years, which means that I oiled/greased all moving parts, and considered changing the oil.
I sometimes used ether/starting fluid to get it started the first use of the season, but once it was running, it usually started on the first or second pull.
It had two forward speeds, slow, and slower yet. But it was built like a tank, and would throw the snow 30-40 feet. The mechanism for rotating the shoot was flawless, and it had a spring latch system to engage/disengage one wheel, so that it would be easier to turn around with it.
So I don't know who to give the "IT just works" to
Simplicity for a great snow machine
Briggs and Stratton for a great 7HP engine with cast iron cylinder sleeves
or starting fluid and carb cleaner, for cleaning the carb, and getting the engine started, year after year.