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Is there something on the engine that is painted green that can easily be removed and taken to a paint shop and scanned? Or a small chip of paint that can be scanned? Once you know the color you can get some mixed and loaded into rattle cans or use a sprayer.
You might also try calling Cat...
I've seen a lot of A3s with the green engines, with relatively low miles. I find it hard to believe that there have been that many failures of Cat engines to account for all the green engines.