Bruno, is not a stupid question. The oil is all around the cooling system, it is thick black engine oil, the radiator has no other cooler inside it, this vehicle has only one big engine radiator, no transmission, power steering cooler. The oil is probably from a previous blown head gasket or a bad oil cooler. Now i'm cleaning the oil cooler and investigation from where is all the oil in the engine valley.
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I am no expert, but how bout when the engine heats up. Can that cause something to expand and leak? Al