I got my 4.8 november 2012, i took apart those ccv and found the same thing... Although it was all the passeneger side of the engine.. I replaced the rubbers anyways as well didnt see any cracks...
As most of you know, maybe you dont around june i put in catch cans on both sides...
I took them off to see if id drain anything back in septemeber and there was just tiny amount of oil...
I took them off today doing any oil change and heres what i got...
I dont drive too far daily, but ive done extensive research and esp with the freeze here in the states ive made sure to get it hot for a decent while daily... Also took a 400 mile total trip last weekend.
I drained both catchcans - results below--
This is the drivers side - dont mind the yellow container is stained
Now this is adding pass side...
That was about little less then half the cans worth..
So... The real question is why all the milky crap on pass side but not drivers? Any specific reason or ccv/engine difference?
And 2nd is id reccomend all 4.8 do catch cans since even getting it hot during cold months seem to get buildup regardless...