Cummins ISX Breathing

Moisture on the bottom of the filler cap, or the bottom of the blow by tube?

You could pull the valve cover and know for certain.

Of course, it's hard to get all the oil out of a cooling system. Usually takes 4 or 5 flushes for me, and those aren't just fill, bring to temp flushes.

 

Me too

 

dawn soap might help.

 

Cascade powder is what I’ve been told works the best.

 

I've used powder and liquid cascade. Less possibility for blockage with the liquid.

No foaming soaps though like dawn

 

If you use cascade powder dissolve it in a container of hot water first, then pour it in.

 

Cat C15 and 3406 Oil Cooler Removal and Install. When Should You Replace an Oil Cooler? (youtube.com)
Go to the 8 minute mark and start watching there. Adept Ape says to only use Dawn and not Cascade.

 

Ok? I watched it. I have no idea who this guy is, and honestly, his opinion doesn't matter to me.

Not gonna change my thoughts.