G day I have an 89 Nissan Patrol Wagon, the other day it got hot and when I lifted the bonnet there was oil right down the passengers side of the engine bay coming from the radiator overflow bottle, when I took the radiator cap off, I got covered in engine oil, the motor was stopped at the time and when I kicked it over it blew oil out of the top of the radiator, there is no water in the oil in the sump, Any Ideas ????