Most likley, worn or damaged rings, pistons, valve stem seals or possibly a problem with the transmission vacuum modulator. You'll need to track it down.
cause so times if you crash in a rock or a tree . then the oil comes out of the pipe
The burning smell from the exhaust pipe may be caused from oil or transmission fluid leaking into the exhaust pipe. For example, if your turbo is failing on the car, then that can cause leakage from the manifold into the exhaust pipe. There may be other reasons, too, which other people will be better articulating.
Maybe a blown head gasket
Valve cover gasket is probably leaking oil onto the exhaust manifold or the oil filter may be leaking oil onto the exhaust pipe.
No, it will not cause smoke from the exhaust pipe. However the leaking oil can drip on the exhaust manifold where it will be burnt and smoke.
No. The only substance that should go into an exhaust pipe are the combustion gases from the burning of fuel in the cylinders.
Back of the block, to the left of the exhaust pipe.
On front of the motor, beside the exhaust pipe.
its when you have either mixed your oil too rich or you need to ride more on the pipe.
To remove the exhaust pipe from the manifold on a Ford Expedition, start by ensuring the vehicle is cool and safely lifted. Disconnect any hangers or brackets securing the exhaust pipe, and then use a socket wrench to remove the bolts connecting the exhaust pipe to the manifold. If the bolts are rusted or stuck, apply penetrating oil and allow it to soak before attempting to remove them. Carefully pull the exhaust pipe away from the manifold once the bolts are removed.
You may have oil on the exhaust, once this has burnt off the smoke should stop.
Unburned fuel in the exhaust system causes the backfire from the exhaust pipe.