Multifuel Engine Question

[pmulcahy11b]

How exactly do multifuel engines work? I always thought that some parts changes were required to run off a different fuel type for a multifuel engine -- but right now I am working on the Ukrainian T-72AG upgrade, and on the global Security.org web site, I found the following:

"The engines in question are two-stroke multi-fuel liquid-cooled diesels with straight-flow scavenging, with horizontally-placed cylinders and opposed pistons. Both the 6TD-2 and 6TD-1 will run on various fuels including diesel fuel, petrol, kerosene, jet engine fuel (or their mixture in any proportion)." (Italics are mine.)

So apparently, you don't need to change any parts, at least in the 6TD-1 and 6TD-2 engines. Is this peculiar to the 6TD-1 and 6TD-2? Is it the result of new technology? Or is this actually the way multifuel engines have always worked?