Here is a VOA I had run on Harvest King All-Fleet 15W-40. This oil is on Ford's WSS-M2C171-F1 approval list. CITGO provided me an MSDS for this oil, confirming to me that they are the manufacturer. I plan on using it in an AMC 360 V8 with flat tappets that I'm mostly concerned about the potential for fuel dilution from it being carbureted. I have previously used Rotella T and Chevron Delo 400LE 15W-40 in this engine. The price of Harvest King is currently $12 for 2 gallons or $8 for 1 gallon at my local Rural King.