Battery Condition: Sitting for an extended period without use often drains the battery and diminishes its lifespan. You may need to replace the battery.
Fluids and Lubricants: After sitting for such a long time, the essential fluids of the truck (engine oil, transmission fluid, brake fluid, etc.) and its lubricants may deteriorate or lose effectiveness. Check these fluids, and plan on changing them immediately upon purchase.
Tire Condition: Prolonged inactivity can affect the quality and shape of the tires. The rubber might crack or dry rot due to prolonged contact with the ground without pressure changes from regular driving. Consider inspecting and possibly replacing the tires.
Rust and Corrosion: Sitting uncovered for three years exposes the vehicle to environmental hazards such as rain, sunlight, and humidity. Look closely for any indicators of rust or corrosion on metal surfaces of the car's interior or exterior or its undercarriage.
Seals and Gaskets: With age, seals and gaskets can become brittle and leak, leading to issues throughout the engine or vehicle if it has not been periodically started to keep such parts functioning.
General Maintenance: Sitting for so long implies a lack of vital and timely maintenance. You will likely need immediate checks on other essential parts like belts, hoses, fuel system components, filters, and brakes which could have also deteriorated.
For any vehicle you intend to purchase, especially one that has been dormant for such a duration, it's crucial to arrange a checkup at a competent automobile service shop before committing to the purchase. They can provide additional diagnostics and insights to verify the condition and help you address any issues before putting the truck back into daily service. By being aware of these aspects, you can make an informed choice that fits your financial and transportation needs.