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i would definately take this to a diesel repair shop for final diagnosis......but from what you told me, you have a very excessive amount of crankcase pressure in your motor causing the pressure to be forced out the easiest path it can take....which is through the breather on the left hand vavle cover which also has a lot of oil in the area..........
this indicates a high possibility of "blowby" which essentually means the rings on your pistons are no longer sealing properly and thus some of the pressure is entering the crankcase. the cause could be many things if this does end up being the issue. it could be a low pressure oil pump that can no longer deliver enough oil at some lower RPM ranges......although this is unlikely because you would probably be having problems with your fuel system also...........but the most common causes are dirt entering the air intake system, which can also be seen by looking at the vaines of the turbo after taking off the air intake from the turbo......or lack of maintanence.....amongst a few other mechanical things also.........
bottom like is someone who knows what they are doing needs to look at it, because i would hate to condemn a motor on here for sure without someone physically looking at a truck first.......Marc
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