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For those wondering, it's BG 44K fuel additive. It usually comes in two parts; one that is attached to the fuel rail to clean the injectors and the other is a can that you dump into the fuel tank. Usually sold as a service in the dealership, not normally sold over the counter. Good stuff. I've used it on and off over the years, mostly just the fuel tank additive. I've got a good friend that runs the service and parts departments of a local domestic dealership and he hooks me up when I need some.