Inspecting the engine of a used tractor is crucial before finalizing any deal. Watch for excessive exhaust smoke upon cold startup, which often signals worn piston rings, faulty fuel injectors, or head gasket leaks. Check the oil cap for milky residue, inspect coolant reservoirs for contamination, and listen closely for abnormal knocking sounds while idling under light load. https://los-cabildos.hellobox.co/item/7747171/check-hydraulic-systems-transmission-fluid-on-used-tractors