Is the 3rd service just oil and spark plug?
Is the 3rd service just oil and spark plug
oil, plug, valve check and most likely adjustment, checking every bolt and so on. checking brake system and replacing the parts that is broken if there is any, brake pads, clutch system and so on
Better ask the Chief Mechanic and his ginger apprentice!
Will he put it in his magic van and drive around the block until the oil falls out?