Safety first: Turn OFF the generator, disconnect battery negative, and place absorbent pads under the leak area. Avoid slipping hazards.

Clean and inspect: Wipe down oily areas with rags to identify the fresh leak source. Check around the oil filter, drain plug, and valve cover.
Oil filter and drain plug: Ensure the Kubota oil filter is hand-tight plus a small additional turn as specified. Verify the drain plug is snug and has an intact gasket.
Valve cover gasket: If oil is seeping from the top of the engine, the valve cover gasket may be hardened. Replace the gasket and torque bolts evenly.
Crank seals and pan: Oil at the front or rear of the engine may indicate crankshaft seal or oil pan gasket leaks. These repairs are more involved and may require engine removal (technician recommended).
Refill and monitor: Top up engine oil to the correct level and monitor for further leakage during a test run.

Generator is leaking engine oil onto the base frame or ground; no error code is present yet.

Possible Causes