I discovered a slight oil leak at the inlet to the turbo. Unscrewed the nut and found a small copper washer inside. Looked ok, put it back together. Drove 20 miles checked it and it was really leaking. I assume the little washer is bad. Any help

 

Generally speaking copper washers are only good once. In my past old days of motorcycling we would put exhaust "O" rings in the oven to "swell" them so we could reuse them. sometimes it worked out. Just replace em and do it right.