I was reading an earlier discussion regarding smoking (white, smells like mostly diesel) at lower RPMs and clearing up as RPMs increase.. My truck does this. I haven't had it diagnosed yet but was hoping to get some feedback before I drop a ton of $$$ on diagnostics. It has been studded and deleted, has about 180k miles. No power loss or engine codes. No coolant in oil. Turbo boost is fine, spools up nicely. I do have a mystery coolant loss. Engine has never ran hot, oil pressure normal. Everything seems to be OK if not for the fact nobody likes me at stop lights...