Automotive servicing involves checking the engine to see what is happening inside and looking at parts of the engine and the presence of oil or lubricant. An automotive service technician inspects, maintains, and repairs electric, gas, hybrid, and alternative fuel vehicles, performing a range of repair and maintenance services in smaller businesses. Routine car maintenance services include checking and replacing wiper blades, changing oil regularly, rotating tires and checking air pressure, checking the battery charge, replacing worn brake pads, replacing the air filter, and checking hoses and belts and replacing old spark plugs.