oil somewhere it shouldnt be

[SexGod]

hi guys i opened my radiator the other day and i found some oil substance in it and i feels all gooey my car runs ok a bit sluggesh but it doenst over heat at al does anyone know what it could be and if its bad . any help would be good.
cheers ryan.

[mouce]

Is there any water in your engine oil? Is it nice and black engine oil, or is it creamy/foamy?

[SexGod]

nah it looks nice and black

[Frd_thmsn]

Maybe someone has put soluble oil in the radiator , a lot of people use it in place of coolant as it lubricates the internals.

Or else someone did what my Mum did 30 years ago when she got her first car and licence , filled up the engine with water and put oil in the radiator True story. It was the original Datsun Bluebird , not the 2nd one released in the early 80s.