After coming back from holiday and my car having been stood for a week there are a number of oil spots under the car and the felt on the plastic under tray is very soggy,are there any known issues that can cause this, car has done approx 30k, 1.4 Tsi. I've also noticed a knocking sound from the rear like something is loose in the boot, unrelated I know but just looking fir advice on both before taking the stealers