Overexposure Nikon 80-200 AFD with D90

Try to figure out if the camera and lens also over exposes wide open - if not, then the problem could be that the aperture lammelae are sticking to each other (my 35mm 2.0 does this due to oil on the aperture lamellae. Makes the lens over expose, because the aperture lamellae close in too late due to lag because of the oil... Wido open exposure is spot on !

Kind regards
Jacob