Took off my oil cooler and one of the hoses has sludge in it

2000 taco v6 3.4L 5VZ
Took off my oil cooler today due to a leak and discovered this sludge I. One of the hoses, what could be the cause of this? I’m I fucked or can this be solved with a coolant flush?

 

That's not ideal. I've hear of running a qt of marvel mystery with the oil during an oil change to desludge a motor. I've never needed to do it personally so I really can't comment on it's effectiveness.

 

Isn’t this a coolant line though? Doing anything during an oil change wouldn’t do anything would it?
My current hypothesis is of that gasket was bad enough to be leaking some oil likely got sucked in with the coolant line exiting the oil cooler.

 

I think you're correct, I assumed it was an oil line but it doesn't work that way. Coolant crud?

 

Is it just at the entrance or is it way back in there

Is there oily dirt caked on the side of the block or frame? Maybe that open end just scraped a scoop of crud as you pulled it out?

 

Negative, as soon as I pulled the hose off I could see the sludgy mixture

 

Well whatever it is, it's had 23 years to build up in there

If you aren't losing any fluids and don't have any headgasket symptoms I wouldn't worry too much

 

With sludge like that, it’s likely that the oil cooler is internally leaking oil into the coolant. New oil cooler time.