Review on Windshield Washer Fluid Reservoir Cap for Buick, Cadillac, Chevy, GMC, Chevrolet Models (Excludes Other Vehicle Makes) by Jamal Yang

Must have less diesel charge for the lid. A little difficult to put on and take off. I fell down a few times while filling up, which of course caused the green trim on the lid. It takes some effort to install the DEF cover with the factory cable, but it is necessary that it does not fall off or get lost. The green cap saved me during a recent DEF tank refill. The spilled DEF may have entered the diesel fuel filler neck.