Today, I feel my four-eye Polo engine rattle like a bulldozer. The mechanic said that the throttle rang and the maintenance was very troublesome.

Generally speaking, if the valve noise is too loud, it is mostly caused by burnt camshaft and excessive valve clearance. If the noise is not particularly loud, it is generally ignored. If the noise is too loud, it is recommended to replace the worn camshaft and rocker arm. If you want a simple way to stop the noise, it is impossible. The valves of Volkswagen are almost louder than those of American cars.