Generac GT-990 — Changing the Engine Oil
Maintenance
For the Generac GT-990, from the Generac owner's manual.
Applies to: Generac GT-990 engine
Before you start
- Any attempt to crank or start the engine before it has been properly serviced with the recommended oil may result in engine failure.
Procedure
- Run the engine until thoroughly warmed up, then shut OFF.
- Pull the oil drain hose free of its retaining clip and remove the cap.
- Drain oil into a suitable container.
- Replace the cap onto the hose and retain it in the clip.
- Refill with recommended oil.
Specs & values
- Oil capacity approximately 1.7 Qts including filter
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.