On other models, particularly those without a drain plug, you may need to tilt the mower on its side with the air filter and carburetor facing upward to prevent oil from entering them. Over time, the oil breaks down due to heat, oxidation, and contamination from dust, dirt, and combustion byproducts.
How to Replace the Oil Filter on Your Push Mower
Fresh oil lubricates the engine, reduces friction, dissipates heat, and carries away contaminants that accumulate during operation. This degraded oil loses its viscosity and lubricating properties, allowing metal-to-metal contact that causes microscopic scoring on cylinder walls and bearings.
In this case, remove the oil fill cap and let the oil drain into a container until it stops flowing. Changing the oil in your push mower is the single most important maintenance task for ensuring a long life and reliable performance.
How to Replace the Oil Filter on Your Push Mower
Before installing the new filter, apply a small amount of fresh oil to the rubber gasket on the top of the filter. Wait for the engine to cool completely to avoid burns from hot components.
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