What increase in octane can I expect when using Valvemaster Plus?
Engen market Valvemaster Plus as an Anti Valve Seat Recession (AVSR) agent, not as an octane booster. However, the use of Valvemaster Plus in unleaded petrol is likely to result in a limited increase in octane. It must be noted that this additive is unsuitable for use in vehicles equipped with catalytic converters.