CAT C13 KCB, oil in water after inframe

My C-13 just did this and it was the inner cooler that cools the intake air.
There's a water cooled radiator inside the intake on the right side of the motor close to the Turbo that can leak coolant strait into the intake if it fails. Water gets past the pistons and into the oil.

 

Its not uncommon to pinch or bind or have one not seat correctly. I can only assume the mechanic lubed them correctly on installation. Also if the block is pitted or worn where they seat they will leak

 

Are you sure its "oil"?
If your getting "fuel" in the coolant it may look like (to some people) oil floating on top.
A bad injector cup could let fuel get in the coolant system. It could also explain the low power.

 

The specified lube for C13 liner o-ring is 5P-3975 rubber lube, same as most ru-glyde for tires. Not oil based.

 

Im glad you got it sorted out

 

Glad to see you solved the issue wtokhi!

I see now my earlier post was totally irrelevant to your situation. I read it backwards I guess and would delete it if I could but the edit window has closed.

I had water in my engine oil not oil in my coolant.
Although quite scary it was a 950 dollar precooler or intercooler that didn't exist on earlier bullet proof Cat engines.

Lots of white smoke, engine missing and went through a lot of coolant. Also was getting coolant into the oil pan just for those who haven't experienced it yet.