When shopping for a serious off-road vehicle, most buyers consider conventional options like the Jeep Wrangler or Toyota 4Runner. These rigs offer reliability, comfort, and reasonable practicality for weekend adventures and rugged terrain. But one YouTuber took an entirely different path, purchasing a surplus military 6×6 truck abandoned in the woods for $2,500 and successfully running it on actual aviation jet fuel.

The vehicle is an M35A2, commonly called the “Deuce and a Half” among military enthusiasts and collectors. This 13,000-pound behemoth represents Cold War-era engineering with capabilities that modern off-road shoppers rarely encounter. What makes this story relevant to truck buyers is what it reveals about decades-old multifuel technology and why certain vehicles are built to adapt to almost any fuel source.

Engineering Designed for Wartime Survival

The M35A2 is powered by an inline-six turbodiesel engine manufactured by White and Continental, marked with a “MULTIFUEL” plate that hints at its extraordinary versatility. Back in the 1950s, NATO engineers designed these engines with a specific military mandate: soldiers needed a motor that could run on whatever flammable liquid they could scavenge in a combat zone.

Unlike modern consumer vehicles locked into specific fuel types, this vintage engine was engineered to operate on diesel, gasoline, kerosene, heater fuel, jet fuel, and even used cooking oil. The secret lies in a component called the fuel density compensator mounted to the injection pump governor. This mechanical device measures the thickness of incoming fuel and automatically adjusts fuel delivery to maintain consistent engine performance regardless of what liquid enters the system.

Modern Wrangler models rely on electronic fuel management systems to optimize performance, but this military truck achieved similar adaptability through pure mechanical ingenuity seventy years ago.

Getting the Beast Running: A Reality Check

abandoned truck restoration project
Photo by Rémi Jacquaint

Reviving a decade-abandoned truck turned into a grueling cleanup operation. Multiple generations of rodents had nested inside the air cleaner housing, and spiders throughout the fuel system created additional hazards. The in-tank electric fuel pump had seized completely, clogged with a mysterious tar-like substance that required hours of brake cleaner treatment, ultrasonic cleaning, and compressed air to finally clear.

Once the fuel system was clean and Jet-A fuel flowed to the injectors, the engine fired up immediately. The multifuel technology worked exactly as intended, proving that 70-year-old engineering could adapt to modern aviation fuel without modification.

The Rough Reality of Driving a Military Truck

6 wheel drive truck brush terrain
Photo by Erik Morales

Getting the engine running was only half the battle. The truck’s braking system had failed catastrophically a decade earlier, sending it flying over a roundabout on the highway. The M35A2 uses an air-assisted hydraulic single-circuit drum brake system, which means one failed line compromises every wheel’s braking power simultaneously.

The previous owner had compounded the problem by mixing DOT 3 brake fluid with the truck’s required silicone-based DOT 5, creating a chemical reaction that destroyed wheel cylinder seals. After bleeding air from the cylinders and applying air tool oil to the rusted brake booster, the driver gained just enough pedal pressure to safely operate the vehicle.

The driving experience itself demanded serious adjustment. The canvas cab flapped violently in the wind, the manual transmission protested every downshift, and the iconic turbocharged engine screamed audibly at highway speeds while the truck maxed out at 40 mph. With the split windshield wide open for visibility, insects pelted the driver continuously. The turning radius proved so poor that maneuvering required extensive planning.

For shoppers accustomed to power steering, automatic transmissions, and climate control in their modern Wrangler models, the M35A2 represents a completely unfiltered driving experience.

Off-Road Capability Proved Undeniable

Despite its braking limitations and outdated systems, the truck demonstrated genuine off-road prowess. It successfully plowed through dense brush and felled trees taller than the cab itself when locked into full 6-wheel drive. This performance showcased why military vehicles remain iconic among serious off-road enthusiasts.

For consumer truck buyers, this story illustrates how purposeful engineering created vehicles that survive extreme conditions and endure decades of neglect. Modern trucks offer comfort, technology, and reliability that the M35A2 simply cannot match, yet this surplus vehicle proved that robust mechanical design can outlast time and abuse.

Whether you choose a contemporary off-road option or dream of restoring a vintage military rig, understanding what these older platforms were designed to accomplish helps inform purchase decisions today. The multifuel technology, simplified systems, and indestructible construction represent a different era of automotive engineering than shoppers encounter in modern consumer vehicles.