Final answer:
The positive contribution of sulfated ash in GEOs includes combustion chamber and spark plug cleanliness, cylinder head life improvement, and exhaust catalyst cleanliness.
Step-by-step explanation:
The positive contribution of sulfated ash in gasoline engine oils (GEOs) includes combustion chamber cleanliness, spark plug cleanliness, cylinder head life improvement, and exhaust catalyst cleanliness.
The combustion process in the engine generates by-products and contaminants such as sulfur compounds. Sulfated ash, a residue left after the combustion of a fuel containing sulfur, can have beneficial effects when present in GEOs.
The sulfated ash in GEOs helps maintain combustion chamber cleanliness by preventing the accumulation of deposits that can affect engine performance. It also contributes to spark plug cleanliness by reducing fouling and ensuring efficient and reliable ignition. Additionally, sulfated ash can improve the life of the cylinder head by reducing wear and corrosion. Finally, it aids in the cleanliness of the exhaust catalyst, which helps reduce emissions of harmful pollutants.