Engine has done 8000miles and ilegerything was rebuilt! Gearbox side crank seal got damaged when the engine was fitted and leaked from then, other crank seal has started leaking since I had a new sump fitted, don't no what caused it, the head was completely stripped down, port and polished the. Rebuilt after a chemical clean, block also chemically cleaned For full info pm nastyrash2003 or find Cheshire Glanza aka Paul shiel and he will give you some info