It's always much cheaper to buy oil by the gallon versus by the quart. If you check the Wally World price on Mobil 1 in a five-quart jug you might be tempted to make the switch to full synthetic.
As long as the diesel oil is the right viscosity, it's probably fine for your truck. Most "heavy-duty" oils are also gas-rated; check the spec. I do NOT recommend running 15W-40 in any water-cooled gasoline engine, although you might get away with it in a hot climate. I'm guessing your truck requires 10W-30.
I've switched to synthetic diesel oils for all my small engines. It's cheaper to buy full-synthetic diesel oil by the gallon than non-synthetic by the quart.
An interesting bit to know if you own a motorcycle: If you run a synthetic oil in a wet-clutch motorcycle it needs to be "MA" rated. (Pretty much all motorcycles other than BMW are wet-clutch.) MA-rated Mobil 1 is usually over ten bucks a quart. But there are MA-rated full synthetic DIESEL oils! I haven't made the switch yet, but I'll probably switch my Triumph to a synthetic diesel oil on its next change.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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