Milky Oil in Generac Generators: Causes and Solutions

Discovering milky oil in your Generac generator can be concerning, but understanding the causes and appropriate actions can help resolve the issue effectively.

Possible Causes:

• Condensation: Milky oil can result from condensation buildup within the engine, especially during periods of inactivity or when the generator operates at low temperatures.
• Water Contamination: Water infiltration into the oil system due to a damaged gasket, seal, or internal engine issue can cause the oil to appear milky.
• Coolant Leak: A leak in the engine's cooling system can introduce coolant into the oil, leading to a milky appearance.

Recommended Actions:

If you notice milky oil in your Generac generator, consider taking the following steps:

1. Inspect: Thoroughly inspect the generator for any signs of coolant leaks, damaged gaskets, or other issues that could contribute to water contamination.
2. Address Issues: If any leaks or damaged components are identified, repair or replace them promptly to prevent further contamination of the oil.
3. Oil Change: Drain the milky oil from the generator and replace it with fresh, clean oil of the recommended type and viscosity for your generator model.
4. Monitor: Regularly monitor the oil condition and the generator's operation to ensure that the milky appearance does not reoccur. Address any issues promptly to prevent damage to the engine.
5. Run Under Load: If condensation from insufficient heat is suspected, run the unit for longer periods manually or under load to raise the temperature sufficiently.

If you are uncertain about diagnosing or addressing the issue yourself, consider consulting a qualified technician or contacting Generac's customer support for assistance.

Other Articles That Can Help

What kind of oil do I use?

What is the service or maintenance schedule of my air cooled generator?

Where to find a parts manual, install manual, owners manual, exploded view or wiring diagram?