When fixing the oil leakage on a Citroen GS or GSA, you have to watch this excellent series made by the Dutch GS club together with a group of Citroën DS enthousiasts called DS TT (DS Technical Team). Egbert Meeter, who was a Citroën mechanic in a workshop in the seventies, takes you through the whole process of removing the engine, repairing it and putting it back together. It a lengthy, but truly great video series! Here’s part one:
The whole job is split into 4 video’s. Check em out. Once again; highly recommended before starting a project like this.