You need to disengage the plastic caps from the quick-connect fittings, pull the caps back along the pipe, pull on one of the open ends of the retaining ring, and rotate the retaining ring around the quick connector until the retaining ring is out of position and can be completely removed. You also need to discard the retaining rings, remove the
Engine Oil Cooler line, pull the lines straight out from the connectors, clean all of the components in a suitable solvent, dry them with compressed air, and inspect the fittings, the connectors, the cooler lines, and the cooler for damage, distortion, or restriction.