Blue smoke 2000 dodge durango Heavy blue smoke at idle after sitting for about5 mins. smells like exhaust but also slight oil smell

White smoke is water in the cylinders/exhaust. (bad head gasket) White with a bluish color is oil. Black smoke is to much fuel. Which do you have.

The most common cause of blue exhaust smoke is oil leaking past engine seals and into the cylinders where it then mixes and burns with the fuel. Oil leaking into the cylinders can cause a rough idle, misfire and fouled spark plugs. So best bet is to have a local repair shop inspect for internal oil leakage.

You don't mention what that smell is reminiscent of?

You don't mention the colour of the "smoke" and you didn't say whether the engine is petrol or diesel?

You don't mention whether the road behaviour/performance is normal?

White smoke is almost always steam or in the case of a diesel it could be an unburned fuel mist, grey/black is excess fuel and blue or grey/blue is burning oil.

Some steam is fairly normal until the engine and exhaust system is hot but excessive amounts could be one symptom of head gasket trouble. If the engine is drinking coolant and sending it through the exhaust as steam it will sometimes smell spicy.

Burning oil smells a bit like burned eggs in the frying pan.

If the car hasn't ultra-low sulphur oil and fuel the catalytic converter will convert sulphur traces into hydrogen sulphide - the bad egg gas...

Black smoke is excess carbon, blue smoke is oil burning, white smoke is water/steam. Is your coolant level ok?

what does the exhaust smell like? if it has a sweet smell to it check your head gasket, and head. there does not have to be oil in the coolant to have a bad head gasket. if there is a heavy engine oil smell, check to see if your turbo is bad. if it smells like raw fuel you either have an injection system or compression problem

general rule of thumb, metal expands when warm, Blue smoke is oil, white smoke is either A: water in your exhaust, B: excessive fuel
If you have white whispy smoke any time you idle, i would be checking your catalic converter, If you have blue smoke on idle at the time of start till your motor warms up id suggest it would be one or more piston rings with slight wear (normally first sign of serious wear) generally you can tell oil smoke by the colour and the smell. it will smell rather burnt and will be obnoxious. if it is white then its more than likely "steam" and of course carbon monoxide, so it should generally disapate very quickly. which is usually ur catalic converter or in some cases more serious the first sign of a blown head gasket as you get coolant (or anti-freeze) leaking into the combustion chamber. that can be pressure tested by ur local mechanic.
I hope this has helped cheers

oxegen sensor?

If its smoking that bad you should be able to tell if its oil or antifreeze by the smell, stand behind the car as its running, if its white and you smell a sweet smell its antifreeze if its blue and smells like a oil refinery its oil.

Not sure if engine coolant smells like rotten egs when it burns inside the cylinders , but it sounds like you may have blown a head gasket. Coolant and/or oil could be getting inside combustion chamber. Another possibility is that the catyletic converter might have broken up and colapsed onto the screen where it goes into the exhaust. Might give the rotten egg smell and block the exhaust enough to cause backpressure sufficient to cause the engine to run poorly too.
Try putting your palm over the exhaust pipe , if the exhaust is coming out in pulses (pop ,pop,pop) thats normal , if it is just slowly flowing out with no noticable pulses , I would check into the cat converter problem.

Have the pcv valve checked (positive crankcase ventiation) I had a pontiac that did the samething. The pcv was bad.Changed it and no more smell.