I was thinking about using some of that Prestone Fuel Injector Cleaner on my L-300 but I was wondering if it might harm my engine? I was alsowondering how well a $5 product could clean Fuel Injectors on a car? So what do you think is it worth it, or is it a waste of money to use it? And would it do any damage to my engine? Thanks, for any, and all help on this.