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While bad valve seals can cause some serious blue smoke, the condition isn't necessarily "life threatening". You may end up with some oil fouling of plugs and "after-run" or "dieseling" if the vehicle is carburated, and there may be some other inconveniences, such as hard starting if you get too much oil in the upper cylinder, but in general it won't cause the engine to suddenly fail.On the other hand, are you certain that it's valve seals or could it be ring problems? In either case, it is an indication of engine wear and for optimum performance, fuel economy and to minimize emissions, it would really be a good idea to take care of the problem.

Answeryour engine should be fine for quite a while, but in most States that is '''illegal''' "enviromental laws "and you will get fined.

try changing you oil to 20/50 it may help you cut down the smoke .

Answerif you are going to continue to drive your car i would suggest that you DO NOT change oil weight, stick with your manufacturer's recommended weight, most likely 5w30, but you may want to look into using a product like max life or other high mileage oil, this has helped me considerably.
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โˆ™ 2011-09-12 22:10:33
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Q: If your car is blowing blue smoke and it is most likely the valve seals that are bad what is the life expectancy of your engine?
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