Questions and answers

Why does my exhaust smoke blue?

Why does my exhaust smoke blue?

Blue smoke can often look like grey smoke at first. But if you notice a distinctive bluish tint, it may signal that the engine is burning lots of oil. This could be due to worn engine components like piston rings, valve seals, or PCV (Positive Crankcase Ventilation) valves.

What causes blue smoke at startup?

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. Blue exhaust smoke only at start-up can indicate worn piston seals or damaged or worn valve guides which may also cause a rattling noise.

Can you drive with blue smoke from exhaust?

Blue smoke from a car exhaust is generally a bad sign, and the cause of it will need to be repaired as soon as possible. It’s either a problem to do with the oil, or internal engine components.

What color should your exhaust be?

It is considered normal when the exhaust coming from your vehicle is light or thin white. This type of smoke is usually just water vapor. You will notice it when you first start your vehicle, especially on cold days. The reason for this form of exhaust is that condensation collects naturally in the exhaust system.

What does Blue exhaust mean?

Blue/gray exhaust smoke means there’s likely an oil leak and your engine is burning oil. The leak could be caused by several issues like leaking valve seals, damaged piston rings, or worn cylinder walls.

Is blue exhaust bad?

Blue Exhaust Smoke You are right to be concerned. If you are noticing blue smoke from the exhaust, it means your engine is burning oil due to an oil leak. This symptom could be the result of a leaking valve seal or a problem with a piston ring.

What Colour is fuel smoke?

Fuel Return: A restricted fuel return line will cause a rich fuel condition. White/Gray Exhaust: White exhaust smoke is an indication that coolant is burning in the combustion chamber.

Is white smoke from exhaust bad?

In general, thin white exhaust smoke (similar to water vapor) could be nothing to worry about. Thick white exhaust smoke usually indicates a coolant leak, which could cause overheating and put your engine at a serious risk of damage.

Can bad gas cause blue smoke?

If these valves are worn down or broken, the oil will get into the engine. When this happens, the air, oil, and gas will all burn together causing the blue smoke to appear. This valve is responsible for releasing the pressure into the intake manifold.

What does blue smoke coming out of exhaust mean?

Blue smoke coming out of exhaust is a warning signal that you can not ignore. It is never a good signal and can indicate several problems. But if you spot it early, know what to do and act on it, these problems can be fixed.

How can I get the Blue out of my exhaust pipe?

Blue Job (link to is an excellent choice among many and can help get the blue out of your motorcycle exhaust. You simply put the product on the pipes and work it in to polish it. It should eventually take out the blue that was initially formed.

What kind of smoke comes from exhaust pipe?

Blue or gray smoke coming from the exhaust pipe. White smoke or water vapor coming from the tailpipe, especially in the morning when the engine is cold. Black smoke or very dark smoke coming from the exhaust pipe.

Why are my exhaust pipes yellow and blue?

The yellowing of exhaust pipes happens through the same process as the appearance of blue. Essentially, yellowing is the warning sign that blue will eventually appear if it is not polished in time. Yellow exhaust pipes are usually a little easier to polish than blue pipes since blue indicates a more mature oxidation process.