In my experience the multi-fuels were not reliable and got replaced with diesel-only engines:
- "One large use of a military multi-fuel engine was the LD series used in the US M35 2 1⁄2-ton and M54 5-ton trucks built between 1963 and 1970.
A military standard design using M.A.N. technology, it was able to use different fuels without preparation.[4][5]
Its primary fuel was Diesel #1, #2, or AP, but 70% to 90% of other fuels could be mixed with diesel, depending on how smooth the engine woud run.
Low octane commercial and aviation gasoline could be used if motor oil was added, jet fuel Jet A, B, JP-4, 5, 7, and 8 could be used, in an emergency fuel oil #1 and #2 could be used.[6]
In practice, they only used diesel fuel, their tactical advantage was never needed, and in time they were replaced with commercial diesel engines."
