How often should you service a snow blower?
Updated July 2026
Service a snow blower every fall, before the first storm rather than during it. A quick pre-season pass means fresh oil, stabilized or ethanol-free fuel, and a look at the belts, shear pins, and auger. The single most common failure is a gummed carburetor from fuel left to sour over the summer, followed by a missing shear pin that leaves the auger spinning uselessly. Either one turns a snowed-in morning into a repair-shop wait when every shop is backed up.
What changes the interval
| Your situation | Interval | Why |
|---|---|---|
| Engine oil | Change every fall (or 25–50 run hours) | Cold-thickened old oil strains the starter and scores the cylinder |
| Fuel | Stabilize or drain every spring | Ethanol gas gums the carburetor in as little as 30 days |
| Shear pins | Inspect each fall; keep 2–4 spares | A pin shears by design on impact and the auger free-spins until you swap it |
| Belts (auger and drive) | Inspect yearly; replace every 3–5 years | A glazed or cracked belt slips, so the machine will not throw or drive |
| Spark plug | Replace every 1–2 seasons | A fouled plug is the top hard-start cause on a cold morning |
| Skid shoes and scraper bar | Check yearly | Worn shoes let the housing drag and chew the driveway |
| Auger gearbox grease | Check every few years | A dry gearbox overheats and seizes the auger |
The cost of skipping it
What skipping it costs: a carburetor gummed by stale fuel is the number-one no-start, and a clean or rebuild runs $60–150 at a shop that is buried in work every December. Add a slipped belt ($15–40), a sheared pin with no spare ($5–15 a pack), or a fouled plug, and a machine you paid $600–1,500 for sits dead through the storm it was bought for. A full season of service parts, oil, plug, pins, and a belt, totals $30–60. Storing it all summer with untreated fuel in the tank is the single most expensive habit.
How to do it (1–2 hours · DIY, or $80–150 at a shop)
- Before the first storm, run the engine a couple of minutes to warm the oil, then drain and refill it and check the level on flat ground.
- Fill with fresh fuel dosed with stabilizer, or top off with ethanol-free gas, and run it briefly to pull treated fuel into the carburetor.
- Flex the auger and drive belts by hand; replace any that are glazed, cracked, or missing chunks.
- Confirm the shear pins are intact and tape two or three spares to the handle so you never hunt for one mid-storm.
- Pull the spark plug and regap or replace it if the tip is black or worn, then check that the skid shoes and scraper bar are not worn to bare metal.
Knowing the interval is the easy half. OnOtto reminds you at the right interval, and it won't let you snooze it into next year. Tasks persist until they're done, and completing snow blower service schedules the next one automatically.
Put this on autopilot, free for 30 daysFrequently asked questions
My snow blower will not start after summer storage. What is wrong?
Nine times out of ten it is the fuel. Modern gas with ethanol draws in moisture and turns to varnish that clogs the tiny carburetor jets in as little as 30 days, so a machine parked in April with a full tank simply will not fire in December. Fresh fuel plus a shot of starting fluid may limp it along, but the real fix is pulling and cleaning the carburetor bowl and jets, a $60–150 shop job. Prevention is far cheaper: stabilizer or ethanol-free fuel before storage.
What is a shear pin and why did my auger stop turning?
A shear pin is a deliberately weak bolt that fastens the auger to its drive shaft. When the auger hits a chunk of ice or a hidden newspaper, the pin snaps on purpose to save the far pricier gearbox, and the auger then spins free without throwing snow. Replace it with the exact shear pin for your model, never a hardware-store bolt, which is too strong and will let the next impact destroy the gearbox instead. Keeping a few spares on hand is the whole trick.
Should I drain the fuel or run it dry before storage?
Either works if you commit to it. Running the engine dry empties the carburetor so nothing is left to varnish, which suits owners who store the machine for six-plus months. The alternative is filling with ethanol-free gas plus stabilizer and running it a few minutes so treated fuel reaches the carburetor. What fails is the middle path: parking it with a half tank of ordinary pump gas. See the real price of that shortcut in storing a snow blower with fuel in it.
How long should a snow blower last with this care?
A single-stage blower generally lasts 8–15 years and a heavier two-stage unit 15–25 years when it gets fresh oil, clean fuel, and belts replaced before they fail. The engines rarely wear out first; carburetors gummed by neglect and rusted augers do. Our snow blower lifespan guide breaks down single-stage, two-stage, and battery models.