[7.3l dieseltrk]

What would cause oil to be in the coolant tank, I checked the oil dipstick and no evidence coolant in pan, so I am thinking that the
Oil cooler went bad or gaskets, what do I need to flush the coolant system, I have new gasket ordered for the oil cooler and cooler
Any other things to check.

 

[RT]

The cooler is a logical site. Flush the coolant with a Prestone kit with just water first to get the bulk of the contamination out. Then, put a gallon of simple green in and run that for a few trips. Then do the full coolant flush like Gooch or Smokeywren wrote up.

 

[Gator5713]

Most likely the cooler. Just had to rebuild mine (again) and did a friends about a week ago.