I recently got a 46 2 ton that has been sitting for some time, but runs pretty good.The oil is black and needs changed real bad.There is a lot of crud on the bottom of the filler cap, so I expect the whole engine is sludged up.How can I be sure the oil I put in it is nondetergent?Don't some of the letters in the specs. identify it as detergent or nondetergent?I don't want to take this engine apart right now to clean it up, and don't want to use the wrong oil and stir things up.Was going to use a sae30 weight. thanks Jim.
