Engine Coolant Services

Recently did some work for Tranztech where they had about 8 liters of oil in the cooling system. Tranztech had cleared some but it was not going away.
The oil cooler had been repaired so it wasn't introducing more oil.
Filled with a oil emulsifying agent and got it hot, flushed it with my machine until clean.

Got a text from Tranztech a couple of days later saying the cooling system looks mint as.

Continuing to replenish a large fleet. We head down to Hamilton once a week to replace the thermostats and coolant.

ETL don't just have excavators for hire check them out here:

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Bit of a fishy smell in this one, not entirely sure about how it smelled of fish.
*Theory One*
Salt water was put in to top up.
*Theory 2*
Fish oil added for a prank or only thing on hand.
*Theory 3*
Fish being store in the water.
*Theory 4*
A salt water aquarium in your engine, i didn't find anything exotic.

Whatever the reason its not good for steel.

Big thanks to ETL for having us round to check and replenish their coolant in the fleet of excavators, checked the majority of the fleet and have been asked back to do some more.