Mannol 9954 Octane Plus Additive 450 ml is a high performance octane booster and fuel system cleaner for petrol engines. It raises octane number by 3 to 6 units depending on base fuel while protecting against knocking and engine detonation. The premium detergent formulation cleans injectors intake valves combustion chambers and spark plug tips to restore smooth idling sharp throttle response and optimal fuel economy. It adds lubricity to fuel pump and injector components which helps reduce wear and extends component life. Compatible with all petrol fuel grades including ethanol blends and safe for catalytic converters. Add one 450 ml bottle per 45 L tank for regular maintenance. Mannol 9954 supports cleaner combustion reduced engine noise and improved engine performance.