Most standby generators are programmed to run a brief self-test weekly — typically 5–12 minutes under no load. This keeps the engine lubricated and the battery charged. Listen for the weekly exercise; if it stops running, call for service.
Annual professional maintenance should include: oil and filter change, air filter inspection/replacement, spark plug inspection, battery load test, coolant check (liquid-cooled units), transfer switch operation test, and a load-bank test to verify output under real load.
Oil change intervals depend on run hours. Generac recommends the first oil change at 25 hours, then every 100–200 hours or annually, whichever comes first. After an extended outage, change the oil before the next season.
DMES LLC offers annual generator maintenance visits. Scheduling before storm season (late summer/early fall) ensures your unit is ready when you need it most.
Information provided is general guidance for homeowners. Every home is different — contact DMES LLC for advice specific to your situation.