Anyone know if any studies been done to see what the long term effects of gasoline additives might be? I'm specifically thinking of Techron and Lucas UCL. One is primarily for injector cleaning, while the Lucas seems to primarily lubricate the moving parts in valve/upper piston area. But what effect is there to the catalytic converter; what about the ring/skirt area? I've seen Bob's video regarding the Lucas UCL, and it did leave deposits, although minor. I'm looking for scientific results, not just "feel good" I'm doing my engine good by these additives!