In the beginning the trucks were powered by a Reo OA-331 gasoline engine. The cargo variant wsa the M35 (also M34).
The M35A1 cargo truck was powered by the LDS-427 Multifuel engine with turbosupercharger - these engines, BTW, had no fuel density compensator.
The M35A2 cargo truck was initially powered by a LD-465 Multifuel engine. This was a naturally aspirated engine (no turbo), and was equipped with a fuel density compensator.
Later M35A2 as well as the M35A2C cargo trucks were powered by the LDT-465 Multifuel engine. This engine had a turbo for emissions reasons, and was equipped with the fuel density compensator.
The M35A3 cargo trucks is powered by a Cat Diesel engine (and an automatic transmission) - these relatively scarce trucks are the only true Diesels of the bunch.
Some of the M35A2 and M35A2C trucks have had their fuel density compensators bypassed, and accordingly have been labelled "Diesel fuel only". Other fuels will burn, but not very effeciently, both in terms of consumption and resulting horsepower.
The Multifuel engine as designed and isntalled at the factory will burn Diesel, kerosene, jet fuel, gasoline and a host of other fuels. Mixing and adjustment is not required - simply pump the fuel in the tank and drive.
Hope this helps,
David Doyle
