Just had my car serviced and timing belt changed. Had the car back for two week s after 500 miles use when the oil light came on. Turned it had leaked 2 litres of oil. Service company came back and stated that the rocker cover gasgets were leakimg. Ha dtheose changed and still leaked. Just been told that the cracnkshaft sela had gobe and the seal to the metal plate behind the sela. Has any one heard of these seals going after a service???