Hey Phil,

By the looks of the smoke at the diesel meet, I would not be looking at valve seals as the answer to your problem. Your smoke was WHITE and there was ALOT of it. Only at start up too. To me, this indicates a bad head gasket, cracked or warped head. If you needed valve seals you would have excessive oil consumption (on the order of 1qt/500mi) and excessive BLUE smoke. WHITE smoke is coolant burning.

John