My 2003 toyota corolla was shaking and the engine light came on(misfire cyllinder one)?

and you are?

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My friend who changed my spark plugs(NGK) about a year and a half or 20,000 to 25,000 ago just determined it was cylinder one like the diagnostic said at the auto parts store. I am going to get one tonight and he is going to put it in later. However he was concerned with the oil on the plug, he said I might have a leak into the cylinder. I have never leaked oil on the ground and no signs of burning it. He said he is going to have his engine mechanic look and give his advice because it could possibly be a piston ring or valve seal. I do have to put about half a quart of oil in it every two weeks because it is below the line. WHAT DO YOU THINK GIVE ME BEST AND WORSE CASE< TO RELIEVE MY ANXIETY> THANKS
 
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