Oil Cooler 6NZ

Doing a oil cooler on a 6NZ and when I took the old one off this is what it looked like. I have done a few over the years but never seen one that looked like this. It was mixing oil into the coolant. So I am going to flush.
Customer has been running green coolant and wants to go back with Red ELC. What are your opinions on this? Truck shows 800k on the odometer. Probably 1.8 million.

 

That’s what I thought as well but I did not see anything. Will look closer Monday.

 

It has what appears to be a cat sticker on it. You can't read it anymore. The one thing that we found odd was that there was anti-seize on the 4 bolts that hold it in place. Fresh anti-seize. Maybe he had a water pump go bad and someone damaged it then. I will ask the customer when I see him.

 

Yeah just wondering if there will be any issues if this thing has been running green since day 1 and I switch to ELC.

 

No it is bowl shaped in the end. Even some of the tubes are angled. I would say weirdest thing I ever saw but that would not be true. This is the same customer that had the truck catch on fire a week or so back while it was just sitting in our yard.