Just to save a argument. If you want to use it use it. If you don't want to use it don't. I agree with schurkey if the engine is running hot there is another problem. It might be as simple as dirt and other debris plugging the fins. Or plugged internally. Your truck is 29 years old. If it has the OE radiator I would bet there is a combination of both. Also the block may have build up in it causing a lack of proper flow and heat sheading ability. I look at things like this as "snake oil" or a band aid for a underlying problem. As for new trucks needing it and showing a difference I highly doubt it but that is my opinion. Show me actual data showing that it does something. Not what the manufacturer says it does.