Deposits form in every fuel system, but the amount and how quickly they form depends on the quality of fuel and oil you use, your driving style and engine type. GDI (gasoline direct injection) engine intake valves are prone to rapid deposit buildup because they never get cooled or washed with fuel. The CRC 05319 Intake Valve Cleaner contains groundbreaking technology that reaches intake valves at 150X more concentration than any premium fuel system additive on the market. It is the first product PROVEN to clean damaging deposits from intake valves on all gasoline powered engines, without costly and time-consuming top-engine disassembly. The CRC 05319 Intake Valve Cleaner is proven to remove up to 46% of carbon buildup on intake valves in the first hour after use. It also dissolves and lifts deposits from ALL TYPES of gasoline powered engines.