If your forklift carburetor has oil leakage, you can troubleshoot your forklift according to this article.

Reason 1-1: The gas mixture is too lean - the orifice of the carburetor is blocked or adjusted improperly

Reason 1-2: The mixture is too lean - gasoline supply is not smooth

Reason 2: Valve leak

Reason 3: The high-voltage damping wires are connected in the wrong order or damaged

Reason 4: The engine is overheating

Reason 5: Intake manifold leaks