Exhaust issue

[devilnme97]

I have a 2009 murano that most of the time when started it smokes sometimes is doesnt also the exhaust rattles 48k just replaced the transmission and the front and rear drive shaft. help!!!

[kerrton]

Not much we can do other than to advise you to take your car in for a compression and oil consumption test. Your service technician will be able to let you know if you are in fact burning oil (which you most likely are considering you see blue smoke at startup), and advise on some options. Other than changing oil, there are few options for oil consumption beyond rebuilding the top end of your engine, which at only 48k miles is probably something to consider as this vehicle should have lots of life left in it. Good luck.

[AllegraSwed]

Can you explain the term "Oil consumption" in brief?

[kerrton]

He means the engine is burning oil, which is very bad if its enough that you notice the level dropping between oil changes. The oil lubricates the engine, but does not enter the combustion chamber unless you have worn piston rings, scored piston walls or other issues associated with a worn engine. Burning oil can also be noticed by looking at the tail pipe emissions, as oil does not burn efficiently and is not meant to enter the combustion chamber, you will notice blue smoke at startup often if the engine is burning oil. The other issue with burning/consuming oil is that if you don't check the level often and keep it topped up, you can run the engine low on oil and this can damage or completely ruin an engine.

[audtatious]

Depends on whether it's blue or white smoke. White smoke could be a head gasket....or in the case of my G yesterday a new set of resonators that have to burn in