Generac 8.1 GN — Changing the Oil and Oil Filter

Maintenance · Engine

For the Generac 8.1 GN, from the Generac owner's manual.

Applies to: Generac 8.1 GN, Generac GH-410 engine, Generac GT-530 engine, Generac GT-990 engine, Generac GT-999 engine

Procedure

1. Run engine 5 minutes by pressing MANUAL; then press OFF.
2. Lift lid, remove front panel, pull oil drain hose free of retaining clip and drain oil.
3. Replace cap on oil drain hose and secure with retaining clip.
4. Remove old oil filter by turning counterclockwise.
5. Apply a light coating of clean engine oil to the gasket of the new filter.
6. Screw new filter on by hand until gasket lightly contacts adapter, then tighten 3/4 to one full turn.
7. Refill engine with proper recommended oil.
8. Start engine, run for 1 minute, and check for leaks.
9. Shutdown engine and recheck oil level; add oil as needed. Do not overfill.
10. Re-insert dipstick and/or reattach fill cap.
11. Press the Control Panel AUTO button.
12. Dispose of used oil and filter at a proper collection center.

Full service-parts list: Generac 8.1 GN →

Source: Generac owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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