Hi rodthrower18,

I am sure I it wasn't changed for many years...luckily the forklift only works for loading and unloading merchandise on very short periods, I am also sure this has prevented further damage...
The sludge is for sure due to water presence, my theory is short runs not eliminating humidity from air and causing more and more condensation inside, because radiator tank is OK.. Let's see what happens ahah

Thanks for commenting!! Peace!