How to Change the Oil and Filter on a Riding Mower

Run the engine for 3-5 minutes to warm the oil. Park on a flat, level surface and engage the parking brake.

Turn off the engine, remove the key, and disconnect the spark plug wire(s) for safety.

Locate the oil drain plug — usually on the bottom of the engine or accessible from underneath. Place your drain pan beneath it.

Remove the drain plug with a socket wrench. Let the oil drain completely — this takes 5-10 minutes.

While the oil is draining, locate the oil filter (cylindrical canister on the side of the engine). Place rags beneath it to catch drips.

Remove the old oil filter by turning it counterclockwise. An oil filter wrench helps if it's tight. Some oil will spill — the rags will catch it.

Apply a thin film of new oil to the gasket (rubber ring) on the new filter. This ensures a good seal and makes removal easier next time.

Thread the new filter on by hand — turn clockwise until the gasket contacts the mounting surface, then tighten an additional 3/4 turn by hand. Don't use the wrench to tighten.

Replace the drain plug and tighten it snug — don't overtighten.

Add fresh oil through the fill cap. Check your manual for capacity — typically 48-64 ounces for riding mowers. Add slowly and check the dipstick frequently.

Start the engine and let it idle for 1-2 minutes. Check around the filter and drain plug for leaks. Shut off and recheck the oil level after a minute — add if needed.