Spark plugs to be changed after 20000 kilometers? Honda recommends to change after 80000 km. My car has done 50k and going perfectly ok. Ok I'm changing transmission oil (mine is manual 2012), but what about spark plugs? Moreover, what about fuel filter. Haven't changed it ever since I bought the car. I've only been changing air and oil filters plus the oil of course. Only once changed the brake pads. So, what about plugs, fuel filter and transmission oil? Advice please