How do you add engine oil to a Polaris Sportsman 90?

To add engine oil to a Polaris Sportsman 90, first ensure the vehicle is on a level surface and the engine is cool. Locate the oil fill cap, typically found near the rear of the engine, and remove it. Use a funnel to pour the recommended type and amount of oil into the engine, then replace the cap securely. Always check the oil level with the dipstick to ensure it's within the proper range before starting the engine.