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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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