it was not smoking before the change. When we pulled the plugs out there was oil/brown liquid. The vehicle has 217,000 miles on it and I bought it from a gentleman who has owned it for about eight to nine years, he has never changed the plugs. It was missing a little bit so I decided to change them and that what I found and when we started it up after wards it smoked real bad. Will it go away or should I take it in and have it checked.