what causes water to enter through radiator resevoir and get in the oil on 1998 Oldsmobile Achieva

water got into oil while car was not running what would cause it

1 answer
Water or Coolant can get into the oil by a leaking head gasket, leaking intake manifold gasket or a leaking oil cooler. I believe the intake manifold is a common issue on these engines, but not%2tor]=all