Start-stop is a system which cuts a petrol or diesel engine when the car is stationary, in order to reduce fuel consumption and emissions. When the brake is released, or the clutch is engaged and the driver is ready to move again, the engine starts

STP Start-Stop Petrol Engine Cleaner, specially formulated to help start-stop engines run better for longer, cleans and protects key engine parts, keeps the fuel intake system clean, assists with saving fuel and reducing emissions