What should be done if the engine oil level exceeds the dipstick mark?

[DelLillian]

If the engine oil level exceeds the dipstick mark, it should be drained to the normal level. The functions of engine oil are: 1. To reduce wear between the piston and cylinder, and between the crankshaft and bearings, providing lubrication; 2. To assist in cooling the internal parts of the engine; 3. To clean carbon deposits, sludge, and metal particles from engine components; 4. To reduce gas leakage and prevent the entry of external contaminants; 5. To cushion the load on pistons, piston rings, connecting rods, and crankshaft bearings; 6. To reduce friction, save energy consumption, and minimize wear. Types of engine oil include: 1. Conventional mineral oil; 2. Semi-synthetic oil; 3. Fully synthetic oil.