Truck engines are that expensive, which represent a vast majority of the market. A VW Jetta probably costs more than the car to replace but not $50K, agreed.
Vehicle filters, sensors and hoses clog even more quickly than those of large engines and can result in engine Failure ... leaving Huge engine warranty issues.
Very unwise to use non-ASTM fuel. AMHD's little biojunk machine produces bioscum ... not biodiesel. jmo