Had the head off and pressure tested and checked for warpage. It was trua and flat and passed the pressure test. Did a careful visual inspection and the head looked great. I have no water loss or coolant loss that I would expect from a cracked head. The engine could run better when cold but I suspect it needs a can of diesel purge. THe engines runs well. I was thinkng it could be related to turbo functions or back pressure issues. I will most likely take it to the dealer and get charged to much for them to tell me they can't find anything.
Some advice on removing the head fromyour 300. I had a heck of a time taking the chain guide pins out. Be careful and do not strip them. Get all new plastic and rubber retainers for the injection fuel lines, they will break as you take the off. Have your exhaust manifold checked for warpage, my was realy warped from a leaky gasket on the no. 6 sylinder. Follow the directions carefully when taking the cam shaft off. Change your lifters if you hear any lifter noise, it made a big difference on mine.

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63 190d (sold)
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76 BMW 2002 (sold)
86 190E-16v (Demised at Laguna Seca Turn 9)
87 300SDL (sold)
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95 E320W 311k
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05 C320 4matic
06 E320 CDI 90k (Totaled by a texting 19 year old girl in a nissan)
2013 GLK 250 Bluetek 4MATIC 295k