yes. Though most call it black not blue.
They help burn the fuel creating the exhaust smoke but if it's excessive, it's usually burning oil or running too rich.
burning oil
Burning oil
Literally hundreds of things could cause unusual exhaust color/smoke. To help, here's the general idea of colors and causes: Blue/grey- Burning Oil White-Burning Coolant (and in some cases transmission fluid) Black- Burning Excessive Fuel Hope that helped
excessive piston to bore clearance means that the gap (tollerance) between your piston and the sidewall of your cylinder/block is too large. usually will cause blow-by. the burning of oil, and dark exhaust smoke. also may cause the engine to have a weak compression stroke
burning too much oil
yes burning oil smokes if the exhaust is clogged the motor will not run so if you suspect a lot of oil in the exhaust the engine needs serviced
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.
For steam to come out the exhaust you probably have a bad head gasket or a cracked head. If the turbo had an oil seal fail it would cause blue smoke to come out the exhaust.
The engine is burning fuel.
There are many things that could cause your exhaust temperature to be high. Your exhaust may be plugged for example.
The primary cause of broken piston rings is a lack of lubrication and excessive heat buildup. Broken rings create lost combustion and excessive oil burning.