Hello, I took my 1999 Chevrolet Venture to the electromechanical for the change of the alternator band but this one noticed that my truck was throwing light oil dripping almost under the radiator and suggested to take it to the mechanic because when checking it I indicated that the drip was not from the carter or the engine but as I indicated the base of the radiator had oil accumulated by the drip already accumulated could you help me to know the cause?

It is almost certain that the oil cooler is perforated and has contaminated the refrigerant. The entire circuit must be cleaned, I don't know if there is any product.

good . indeed it is possible that the serpertin (cooler) of the box that usually goes inside the radiator is perforated and filters the oil to the coolant circuit, in the workshops that repair radiators are responsible for solving the problem