Royal Purple ROY11757 MAX BOOST, 16 oz Replaces lead additives for protection of non-hardened valve seats Raises octane rating up to 30 points or 3 numbers Restores power and fuel economy while cleaning deposits from fuel injectors Reduces power loss due to knock-retard in computer-controlled vehicles Reduces engine knocking/pinging and stabilizes fuel Max-Boost is a racing formula and is not street legal.