Exmark QUEST S Series Operator's Manual page 46

Maintenance
5. Change the engine oil filter. Apply a thin film of
clean Exmark 4-Cycle Premium Engine Oil to the
rubber gasket on the new filter.
Figure 37
Note: Ensure the oil filter gasket touches the
engine, then an extra 3/4 turn is completed.
Note: Dispose of the used oil at a recycling
center.
6. Slowly pour approximately 80% of the specified
oil into the filler tube—use oil recommended in
the Checking the Engine Oil Level section.
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Figure 38
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