17 1.8t Passat Is there any waste gas valve broken within 40,000 kilometers?

1. Open the oil filler and test whether there is slight suction with paper. 2. Unscrew the screw of the clamp at the throttle valve, then turn the air pipe left and right to remove it, and then wipe the oil-pumped caliper with a paper towel for later use. Hold one hand, lift the throttle with your fingers first, then hold it steady with your other hand, and the throttle will open. 3. Use an oil dipstick to probe a hole below and probe all the way to the end. Take it out and see if there is oil on it. If it's putty or something, it's not interesting. If there is oil, the waste gas valve has been damaged. 4. Unscrew the oil cover. If air is inhaled, it is not broken, otherwise it is broken.