• Blue smoke from an exhaust means burning oil.Jupiterimages/Photos.com/Getty Images
  
  It is not uncommon for a older car to begin having some blue smoke occasionally come out of the exhaust system. If the color is truly blue, then odds are the problem is oil is being burned in the engine and you have a leak. Even a small amount of oil can create blue exhaust.
  
  

Higher Weight Oil

• While this is only a quick fix, using a heavier weight oil may slow or temporarily stop the leak and eliminate the blue smoke. The heavier weight oil is thicker and has less of a chance of leaking if the hole is small. Unfortunately, if you have a leak, then it will only get worse over time.
  
  

Car Repair

• Oil is not supposed to be burned along with the fuel mixture and there are several gaskets that are used to prevent this from happening. As the car gets older, these gaskets can wear down and cause leaks, which creates the blue smoke. Blue smoke, along with rough idling and a loss of power, could indicate a more serious problem of a cracked head gasket and that could mean extensive repair work to the engine.
  
  

Oil Stop Leak

• If the smoke is causes by a gasket leak, then there are oil additives developed to help stop the leak. The additive is added directly to the oil; when it goes through the system along with the oil, it is supposed to stop the leak at least temporarily and abate the blue smoke.