Post up pictures of the 'white smoke' ... white smoke has historically meant coolant in the combustion but if you have excessive moisture in the fuel system it could be a probably cause. Has this just started happening or has it been going on for a while(ie multiple tanks of gas)?

Did the Nissan dealership do a compression test or a leak down test?

 

His car vapes

 

A blown head gasket won't necessarily cause water to start mixing with the oil. It's dependent on the location of the leak. If it's a minor leak, you could just be getting small amounts of coolant in the combustion chamber, but no coolant mixing with oil (yet). Again a minor leak won't cause any check engine lights at first. Eventually you might see an O2 sensor trip or temps rise. There's simple test kits you can get that check the coolant system for exhaust/combustion gases.

Here's a good "How to" from Scotty Kilmer:

But based on what you've described, you need to pull the heads and replace those gaskets. While you're getting that done I would also recommend having a good machine shop inspect the heads and have all the valve seals replaced. None of this work will be cheap and I don't know what you've put into the car already, but if you plan to keep it for any length of time or if the car is in very good to excellent condition minus the engine, consider it a peace-of-mind investment.
Good Luck!
-Icer

 

Sounds like someone was having fun with a little n2o prior to selling that car.

 

 

 

 

most old ladies dont change out exhaust

 

A scream'n demon old lady does, one that's hooked on the juice.
It would be an odd happening to blow a head gasket without some form of FI on the VQ.
It's always good practice when buying a used car, especially a sports car, to take it to a relatively competent mechanic for a look-see. I'm not trying to rub anything in here Michael cause this situation does suck ***** for sure. Just some late advice for the next time from one M to another.

 

yes and no / agree and disagree ... I'm sure there are many ways to blow your head gasket but simply excessively overly heating the engine where the heads warp will do it ... no FI required!!

 

Sure, but still odd.

 

 

Does the car still have CATs? Or is it running test pipes (resonated or not)? The video posted doesn't show that much "white smoke" and it appears to disappear rapidly when the engine is reved. Does the smoke pour out under constant speed/RPM (2000-3000RPM)? Or only when you've been idling for a bit at a stop?

As dnash said, does the smoke go away when the car fully warms up?

Winter is coming and it's not uncommon for moisture/condensation to build up inside the exhaust system. Aftermarket exhausts are more prone to this. There were nights/mornings when I would be sitting at a stop light with the engine still warming up, watching the steam pouring out the back through my rear view mirror.
-Icer