Can't get rid of EGR code.

What is your question?

I relaced the EGR. I have cleaned the intake several times with spray. I have found oil in the intake below where the tube comes in from the valve cover. Each time I have cleared the code. The light still comes on. Usally it comes on when I'm going down the highway about fifty and break to make a turn. Maybe something to o with the compression. The car has 170 k. The light drives my wife crazy. what can I do to resolve the problem.