Son ran car hot and seems now have oil in radiator. besides blown head gasket any other possible causes. Car starts and runs but over heats due to sludge in radiator. Any suggestion on best methods to flush cooling system of oil?
Thanks

 

Its a 1995 C220 does this model have an oil cooler? There doesn't seem to be any water in oil are first glance I haven't drained the oil yet however but it looks clean on the stick. What is best method to test oil cooler if it has one; prior to pulling the head?