SOURCE: blue smoke
Chances are if you are blowing blue smoke, you are burning oil. Another cause of blue tint smoke is you are burning to much fuel and not enough air. If the engine does not act erratic or acts like it is flooding out, then I would say you are burning oil. The most common problem found with burning oil is either worn piston rings, bad valve seats/seals. If the engine has high mileage, I would recommend any type of oil treatment. Change your oil, filter included, use some form of engine treatment, run it for a few hundred miles, and rechange your oil and filter again. If your engine has over 100,000 miles, I would highly recommend using an oil that is made for high mileage engines. As this oil has additives that will help ease the aging engine. If this doesn't work for you, I would say you need to have the rings and valve seals replaced. You can do this yourself with a little knowledge of engines and pick yourself up a Haynes Manual at your local auto parts store if you do not already have one. Hope this helps. Feel free to comment if you need more assistance. Please don't forget to rate. Thanks!
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. This is most frequently seen in older or high mileage cars with worn seals and gaskets. It only requires a very small amount of oil leaking into the cylinders to cause excessive blue exhaust smoke.
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. An external engine oil leak can drip onto hot engine and exhaust parts causing what appears to be blue exhaust smoke. Other possible causes of blue exhaust smoke include: piston wear, worn valve seals, a dirty or non-functioning PCV valve, worn piston rings, an intake manifold gasket leak, worn engine oil seals and possibly even head gasket failure.
Oil leaking into the cylinders can cause a rough idle, misfire and fouled spark plugs. In addition, a reduction in power and oil loss can be indicators that the blue exhaust smoke is caused by an internal engine oil leak. Internal engine oil leaks can also allow fuel to mix with the oil in the crankcase which will degrade the oil and prevent it from adequately protecting the engine.
Operating a car with a severely dirty oil filter, air filter or improperly functioning PCV valve can also sometimes result in engine oil blow-by, oil loss and blue exhaust smoke. Periodically checking the engine oil level with the oil dip stick will indicate if there is excessive oil consumption. Higher viscosity engine oil can sometimes temporarily reduce the amount of blow-by; however, this is not generally recommended. Excessive blue exhaust smoke indicates a possible internal engine oil leak that should be inspected by an ASE certified mechanic.
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