I have read many articles on whether the proper oil for a 2 stroke Detroit Diesel is a straight weight 'i.e. SAE 30, 40 or 50 or a blended oil such as 15w 40 and there are arguments for both sides as to which one to use, however I just bought a Spartan Fire Truck with a Detroit 8v92TA DDEC engine and have included as a attachment the Specification chart from the manufacturer (Spartan Motors Inc) that lists the recommended oil as 15w40. Thoughts anyone?
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