400-1205 MotorVac CarbonClean GDi Cleaning Service Kit (Contains 1 each 400-2001, 400-6220 & 400-5000EU) (Case of 6 Kits) - CarbonClean GDi Maintenance Kits Keep GDi engines clean. Gasoline Direct Injection (GDi) engines boost fuel economy and performance, while lowering emissions, by injecting fuel directly into the combustion chamber. However, without fuel being sprayed through the intake, dry engine valves quickly accumulate carbon deposits, robbing the engine of performance that over time can lead to engine fatigue or failure. CarbonClean® GDi Maintenance Kit is engineered to keep vehicle intake valves cleaner by removing the sludge, ethanol and water in the engine, and reducing the oil vapers that cause valve deposits.