I've had two 240 wagons over the past 8 years both with fuel injection. The first developed problems with clogged injectors after 3 years which turned out expensive in repairs. As a result of that experience I've made a point of adding injector /fuel system cleaners to the tank of my second 240 and have not had any injector probs in over 4 years. However a auto shop guy commented recently these additives corrode the seals in the fuel system. Whats the story ? Should I use them or what? Thanks for a great forum!