As they continuously refine development of contemporary engines to obtain better efficiency and less pollution, the oil industry was also forced to change the composition of oil to comply to this evolution. By clarifying oil, essential components are filtered from the oil. Just these ’impurities’ protect the friction between camshaft and followers of our classical engines. The lack of essential protective factors in the engine oil can be captured by adding Cam-Shield ZDDP additives. BBT offers a complete range for one treatment, competition, running-in of the engine, assembly or long-lasting maintenance of engines. We also signalize that BBT # 8510-004 Castrol Classic oil 20W50 / 1200 ppm do possess these classical characteristics.