Symptoms
- Engine shuts off shortly after starting (on models with low-oil shutoff)
- Oil on the dipstick looks dark, gritty, or low
- Engine runs louder or hotter than usual
- Oil hasn't been changed in over a season of regular use
Likely causes
- CommonOil level below the minimum markConsumption over time or a small leak can drop the level below safe operating range.
- CommonOil overdue for a changeOil breaks down and picks up contaminants with use, losing its ability to protect the engine.
- PossibleWrong oil viscosity for the seasonUsing the wrong grade can affect cold starting and engine protection.
- PossibleOil leak reducing the level over timeA leaking gasket or seal steadily lowers the oil level between checks.
What to do
- Check the oil level on level ground using the dipstick, without threading it in on some models (check your manual).
- Top off with the correct grade of oil if it's below the full mark, but don't overfill.
- If the oil looks dark, gritty, or hasn't been changed this season, drain it out and refill with fresh oil per the manual's capacity spec.
- Inspect underneath the mower and around the oil fill/drain area for signs of an active leak.
- Wipe up any spilled oil and dispose of used oil at a recycling center, never in household trash or drains.
- Set a seasonal reminder to check oil before each mowing season and change it per the manufacturer's interval.
Tools and parts
- Oil drain pan
- Funnel
Small engine oilSearch: “lawn mower engine oil SAE 30”
When to call a pro
A small engine shop can perform an oil change quickly as part of a routine seasonal tune-up.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.