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Hi everybody! I got 2004 Mitsubishi Endeavor X LS ,it was purchased about two years ago and today I tried to change spark plugs. When I took it out from engine, I found oil on the whole length of the thread. I know, based on my previous experience, that it is very bad for other cars. I am not sure if it is bad for Mitsubishi cars as well. Can anyone please tell me if it is normal or not. Also, after installing the new spark plugs, rpm went down from about 900 to 100. Can anyone also tell me how I can fix this problem. Thank you everyone for your responses.
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