I have a 2012 X5 3.5i, today just noticed that only one exhaust pipe was actually blowing smoke, nothing coming from the right one and have no engine fault lights, does anyone knows whats going on? ne

Whats the coolant level doing? White exhaust is usually a coolant leak into the cylinder.

worn out piston rings require replacement..

White smoke is usually a sign for a bad head gasket. How much white smoke is coming out? Also, are you losing coolant and can't find a drip under the engine?

Could be from that or bad head gasket

Your car shouldn't have just suddenly started burning oil. Its possible it's leaking in the engine compartment and the leak is dripping onto the hot exhaust manifold and the. The smoke is blowing out the back as you drive. I would think it's unlikely that the engine has been damaged since the check-engine light should have come on if the oil level was low enough to cause damage.

If hii find that bluish smoke is coming from the exhaust pipes, then the next thing to check is whether it smokes on acceleration or deceleration. If the latter, it may be just a valve issue. If it smokes a lot on startup, then it may be rings.

It should be under factory warranty, so let the dealer handle it.

There are couplings that hook the manifold to the exhaust.... flex pipes.. about the size of large can of soup... they allow the engine to flex when you punch the gas.... they meet on both sides right underneath the bottom of the engine.... Google "audi a6 flex pipe" you' ll see them on ebay..... its the braided part... Go anywhere but MIDAS! to have it fixed... about $225 per side... That's what my problem was...... good luck

Chances are it is water coming out this is normal to notice some water dripping out of exhaust periodically as the car runs, If the liquid actually smells like gas i am at a lose I have never heard of this occuring.

check for engine's compression...the problem might be due to the valves too. smoke indicates incomplete burning of fuel. hope this helps

Are you loosing coolant? If you are, you may have a leaking head gasket. Coolant will leak into the cylinder and is turned to steam as the engine is running and comes out the exhaust as steam.