This is truely luck of the draw.. Sometimes you can run quite a while with it only leaking oil, other times it isn't long until you have over heating problems and/or oil in the coolant.. Do you have any idea of the age or milage on the head gasket?? Typically this is how a gasket deteriorating from age begins to go.. Keep a very close eye on your engine temp and oil level, as well as for signs of oil in the coolant if you plan to run it any lenght of time..