The heat of the exhaust gasses will turn some polished exhaust pipes blue. This is very common with stainless steel exhausts.
It depends on what color the smoke is. If it is white smoke that usually mean coolant is in the oil and that can be a result of a blown head gasket. If it is a greyish bluish color then it is oil burning. if it is black then you are burning gas.
Blue exhaust smoke is burning oil.
Neptune and Uranus are both bluish in color.
White smoke from the exhaust gas (smoke) only shows that the head gasket is damaged and antifreeze escapes making it mixed with the air-fuel ratio in the combustion chamber. When turbocharger failure occurs, the smoke should be bluish in color due to worn/damaged oil seal.
brownish, bluish colour
white smoke coming out of the exhaust 99 times out of 100 is coolant leaking into your engine and being burned. if this is the case, a head gasket is blown or something in your motor or head is cracked. oil burns a bluish color with a distinct smell.
Blue.
The color is bluish-brown.
Could be a diesel? If not then replace your oxygen sensor on your exhaust. A bad oxygen sensor causes the exhaust smoke to be dark in color.
Bluish greenBluish green can be teal or cyan...Turquoise Color is also a blue-green shade
bluish purplish
Stars have a similar bluish white color due to the gases that are inside of them. When you see stars that are bluish white you know that they contain a lot of hydrogen.