They have several different blends. What one do they say to use in our pickups? 5 gallons would last a long time. I have been just adding a qt. of motor oil at fill-ups. My diesel repairman tells me to add something. A qt. of oil keeps going up so this would cost less and should do better?
There was a study on additives done and, if I remember correctly, motor oil really adds nothing beneficial (does not increase lubrication in fuel).