Ryebuck Engineering Oil Catch Can for Mahindra Scorpio RBEMSCCA1Modern common rail direct injection diesels (CRDs) like the superb 2. 2L engine use an exhaust gas recirculation (EGR) valve that diverts inert gases and the blow by oil vapours common to all internal combustion engines back through the intake manifold rather than venting them to the atmosphere and breaching emission laws. The problem is that over time these vapours create reserves of sludge and soot that build up in the manifold restrict air flow and