Loosing half coolant in 6 hours drive / blow by from crankcase filter .

Have you done a pressure test on cooling system?

Look into EGR cooler issues

 

Grease on oil cap is the mixture of water/antifreeze and engine oil. I would say u've got a cracked head. You won't notice the loss of power if its the exhaust side of the head where the leak is. But it should leak into the cylinder when engine is not running and ending up in engine oil. Drain engine oil but remove drain plug slowly. Just before plug falls out stop turning it and just wiggle it. If there is coolant in the engine it will seep out before oil.

 

Wow..... I am an also an armchair Quarterback but how about do a run down on diagnosing the problem and not spit ball a cracked head. I been guilty of the same thing on the Volvo forum but I learned my lesson.

Get a proper diagnosis from a competent mechanic who will actually check most of things that are mentioned.

 

They will only chaged that 1 liner. Freightliner has been backed up on parts ( liners piston 6 packs.) Last month it was a 3 month wait or longer on a six pack. I haven't heard if that has changed
They might get lucky and find just a single liner and piston to get you back going

Tough luck man.

 

I had a 92 C model Cat that had 1 pin holed sleeve changed out under warranty before I bought it.Same with a friend of mine had 96 Detroit series 60 at Only 70 k miles. Both engines went on to 1 mil + w/o further liner issues. Main thing is keep dca/ nitrate levels in anti freeze under close watch. Cheapest preventative maintenance against future problems.