Reviving this one, I have a similar issue, a wisp of smoke coming out from behind the engine. I had the oil cooler done as it was leaking, its been over a month so any residue must have burnt off by now.
I found a slight drip of oil on a rubber hose on the front left underneath, I think a pipe to the oil cooler? I cleaned it off and it hasn't come back.
There is a bit of water (?) on the transmission undertray, it doesn't look like coolant or oil.
Other than that I can't find anything obvious. It usually happens after a motorway drive so the DPF regen idea is interesting, it might not be quite long enough on the motorway to complete the regen. Although I have had a couple of long drives a few weeks ago and it still comes back.
I do have a slightly warped front left brake disk but I think it smells more like burning oil than brakes.
Did you ever get to the bottom of it?
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