Due to winter weather and mostly working from home these days, I haven't driven my MKS much lately and  hadn't really ran it hard for several months.  Yesterday, I was on my favorite Mexican test track and ran a quick WOT 0-80 or so and noticed some blue smoke from the exhaust - appeared to be oil smoke.  A bit concerned, I tried it a couple of more times and but no more smoke on the 2nd and 3rd runs.

This morning, I inspected the turbos externally and found them perfectly dry.  I pulled the hose off the throttle body and CAC and found very minor residue in the pipe but certainly no oil.   The throttle body was bone dry.   The hose from the CAC on the driver's side was dry, too.  Using the dipstick, I checked for oil in the CAC and there was a very tiny bit - maybe 1/16 inch or less.   

Questions:  Would you be concerned about the tiny amount of oil I found in the CAC?  What are your thoughts on the blue smoke that seemingly was a one-time occurrence? 

It wouldnt have me overly concerned at this point

Just keep an eye on the symptoms for now, if frequency increases or if you smell oil burning, then there would be cause for concern.

If the car seemed bone dry underneath would not worry to much,probably cleaned out some cobwebs during wot,would also check or change your Pcv valve and check to see how much oil is inside the seperator on top of the rear valve cover,any Codes set?  Pour a bottle of heet or Techron fi cleaner since she has been sitting for a while.  Z

Thanks Guys.  The car runs strong and there are no codes.  I just got back from another test run and had no smoke.  The only time I have ever had oil smell was after changing the PTU lube and spilling some on the exhaust exhaust system.  Once that burns off there is no smell and everything is dry under there now.

I will take a look at the PCV system. 

A little oil in the CAC is normal.  You can suck it out of there if you want.  Wouldn't be too worried about the blue smoke as a one time thing as long as it's not something that happens all the time or if you have to keep adding oil.  Then obviously there's a problem.

Thanks, pmezo.  I had the drivers side jacked up so the oil, if any, would run to the side that I could check easily.  It barely made a mark on the dipstick so I am not going to worry about it.  The oil level in the engine never lowers so I guess I will just forget the whole episode. 

It did put out a pretty good cloud of smoke that one time, especially through low gear but as speed built, the smoke subsided and it hasn't done it since.