Briggs & Stratton Commercial Series Operator's Manual page 16

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7. Carefully remove cap (B) and lower hose into an approved
container (C).
8. After the oil has drained, install cap tightly, then attach the
hose to the side of the engine.
9. Remove the oil filter (B, Figure 15) and dispose of properly
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10. Lightly lubricate the oil filter gasket (A) with fresh, clean oil..
11. Install the oil filter by hand until the gasket contacts the oil
filter adapter (C), then tighten the oil filter 1/2 to 3/4 turns.
12. Add oil (refer to the Check and Add Engine Oil section).
Service Air Filter
Air Filter Assembly (Cartridge with pre-cleaner)
WARNING
Never start or run the engine with the air cleaner assembly or
air filter removed as it is a fire hazard.
NOTICE
Do not use pressurized air or solvents to clean the filter.
Pressurized air can damage the filter and solvents will dissolve
the filter.
1. Loosen the fasteners (A, Figure 16) and remove the cover
(B).