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Head gasket is leaking
Quality of fuel plays major role in smoke emission
Subaru 2.5 liter engine has a problem with head gaskets. If you have not had your head gaskets replaced, that is the first thing I would suspect.
suspect improper head gasket R&R, sorry.
any good garage or test center
The only thing that causes smoke in a car is something burning. Steam or vapor coming from the air conditioner can also look like smoke. More detail especially where the smoke seems to be coming from would be helpful. This sounds like something that needs immediate attention and you should not be driving the car if you cannot find the origin of the smoke.
Usually means that the head gasket is blown and you are burning coolant.
The black smoke emission has carbon and other carbon compounds such as Carbon monoxide and carbon dioxide these gases especially carbon monoxide is highly dangerous if unhealed.Carbon monoxide could cause several severe health problems.The color black of the smoke is due to the unburned carbon this is also harmful.There are a lot of chemical in black smoke which could be harmful for your health
cause smoke doesnt do anything
Cigarettes can cause more than lung infections. They can cause cancer, and even death. Cigarette smoke is just as bad as smoke from a fire, and with cigarettes, you are inhaling that smoke. The smoke from the cigarette can also cause cells to die, which is not good at all.
probably an exhaust leak, at or near the exhaust manifold
Stuck or broken oil rings can cause blue smoke.