its the fuel adeditive, Performance Improver, It lubrciates the upper cylinder, pump and fuel lines, and does a deep clean of your valves, injectors and the combustion chambers. Its also used as emissions passer (had a friend who had a catalytic converter issue, ran the P.i. 3 months later without any issue or engine light). Good man! Next time buy from me and save :P
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Do your car and move up to Amsoil.
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