Is Sea Foam safe in a 2017 GMC Sierra Denali Z71 4×4 with a 5.3 motor? [SOLVED] Asked by Jacob R. In Alabama I have a 2017 GMC Sierra Denali Z71 4×4 with a 5.3L motor. Is it safe to use Sea Foam gasoline treatment?
Yes, Sea Foam Motor Treatment is always safe in any gas or diesel fuel system, including your Sierra 5.3! Sea Foam is made with 100% petroleum ingredients that can’t harm your engine. Will work great in your truck’s fuel and oil. Just follow the instructions on the can!