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Hello and welcome to Just Answer, unfortunately these motors are notorious for having valve train issues. The Cam Phasers have engineering flaws, and repair could cost you in excess of $1500. There isn't much you can do from a preventative standpoint, however make sure you religiously change your oil every 3500 miles, use a high mileage synthetic and consider using a lower viscosity oil. These will put less of a strain on the engine and ultimately the cam gears ( phasers).
Im a firm believer of additives, especially Lucas products. They are designed to help your engine perform at higher temperatures with lower levels of friction and help remove unwanted sediment around lifters. I see no harm in giving it a try. Its a low cost alternative to offset or eliminate future issues. Whatever you use though, make sure you are consistent id using it every oil change. That's what will extend the life of your motor.