How often should you service a pressure washer?
Updated July 2026
Give a pressure washer a full service once a year: change the pump oil on serviceable gas units, and before winter storage run pump saver through it and add fuel stabilizer to the tank. The winterizing step is the one that actually saves machines. Water left sitting in the pump freezes, expands, and cracks the housing, which usually totals the unit, so a two-minute bottle of pump saver is the cheapest insurance you will buy all season.
What changes the interval
| Your situation | Interval | Why |
|---|---|---|
| Gas engine oil | Every 50 hours or yearly | The same schedule as any small engine |
| Serviceable pump oil | Once a year | Only if the pump has a fill plug and dipstick |
| Before winter storage | Pump saver and drain | Displace every drop of water so nothing freezes |
| Electric units | Flush and store frost-free | No engine, but the pump still freezes |
| Nozzle tips and inlet screen | Rinse after each use | Grit scores the pump and clogs the tips |
| Idle 30-plus days | Add fuel stabilizer | Ethanol gums the carburetor within months |
The cost of skipping it
What skipping it costs: the big one is a freeze. Water left in the pump over winter expands as it freezes and cracks the pump housing or blows the seals, which usually totals the machine. Short of that, unlubricated seals and stale, gummed fuel mean it will not start or hold pressure when you finally need it. A cracked pump can be a $100–400 part, close to the price of a new $150–600 washer.
How to do it (30 minutes · DIY, plus pump saver)
- During the season, flush the nozzle tips and inlet screen after each use so grit does not score the pump.
- Once a year, change the engine oil (every 50 hours or annually) and the pump oil if your pump has a fill plug and dipstick.
- Before winter, run the tank dry or add fuel stabilizer and idle it in, so ethanol cannot gum the carburetor.
- Run pump saver as the critical step: attach the bottle to the inlet and squeeze until it comes out the outlet, purging every drop of water so nothing freezes and cracks the pump.
- Store it somewhere above freezing when you can; even electric units have a pump that a hard freeze will split.
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 pressure washer service schedules the next one automatically.
Put this on autopilot, free for 30 daysFrequently asked questions
What is pump saver and why does it matter so much?
Pump saver is an antifreeze-and-lubricant fluid you push into the pump inlet until it comes out the outlet, displacing every drop of water inside. It is the single most important winterizing step, because water left in the pump freezes, expands, and cracks the housing or breaks the seals, which usually totals the machine. It also lubricates the seals during long storage. A bottle costs a few dollars and takes about two minutes.
My gas pressure washer will not start after winter. Why?
Almost always the carburetor. Ethanol fuel left sitting for months absorbs moisture and gums into a varnish that clogs the tiny carb jets, so it will not fire. Prevent it by running the tank dry or adding fuel stabilizer before storage. If it is already gummed, a carb cleaning or a $15–30 rebuild kit usually revives it, versus paying $80–120 at a small-engine shop to do the same thing.
Do electric pressure washers need winterizing too?
Yes. They have no engine or fuel to worry about, but they still hold a pump full of water that a hard freeze will crack just the same. Run pump saver through it and store it somewhere above freezing, like a heated garage or a basement. Also flush the inlet screen and nozzle tips after every use so grit does not slowly score the pump seals and cost you pressure over the years.
How often does the pump oil actually need changing?
On gas units with a serviceable pump, meaning one with a fill plug and a dipstick, change the pump oil about once a year or every 50 hours, alongside the engine oil. Many consumer pumps are sealed and non-serviceable, so there is nothing to change; look for a plug first. Fresh pump oil keeps the pistons and seals lubricated, which is what lets a good pump run well past 5 years.