Generac IQ3500 — Changing the Oil and Oil Filter

Maintenance · Engine lubrication system

For the Generac IQ3500, from the Generac owner's manual.

Applies to: Generac IQ3500, Generac GH-410 engine, Generac GT-530 engine, Generac GT-530 engine, Generac GT-990 engine, Generac GT-999 engine

Procedure

1. Press MANUAL and run engine until warmed up, then press OFF.
2. Lift the lid, remove the front panel, and pull the oil drain hose free of its retaining clip.
3. Remove the cap from the hose and drain the oil into a suitable container.
4. Replace the cap, and reposition and secure the hose with the retaining clip.
5. Remove the old oil filter by turning it counterclockwise.
6. Apply a light coating of clean engine oil to the gasket of the new filter.
7. Screw the new filter on by hand until its gasket contacts the adapter, then tighten 3/4 to one full turn.
8. Refill the engine with the proper recommended oil.
9. Start the engine, run for 1 minute, and check for leaks.
10. Shutdown the engine and recheck the oil level. Add oil as needed.
11. Re-insert dipstick and/or reattach fill cap.
12. Press the Control Panel AUTO button.

Full service-parts list: Generac IQ3500 →

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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