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catalog high performance performance oils why use royal purple the most frequent ... in their vehicles after switching to royal purple for instance royal purple® motor ... oil with synerlec® typically improves ... 20 or more synerlec® strengthens the oil to provide unmatched performance and ... protection even after shutdown feel the royal purple difference high performance ... motor oils royal purple® motor oils are extremely popular with performance ... and longer engine life with the use of royal purple® royal purple® gains its ... performance advantages from royal purple s proprietary synerlec® additive ... technology royal purple® provides more protection than ... conventional motor oils including those combined with ...