I understand that people are thinking that it's a corrosion problem, which it's not. The sulphur is buffered so as not to be corrosive. The issue is that the sacrificial boundary layer that forms with GL-5 (GL-4 forms one too, just not as strong) has a surface bond strength that is stronger than the brass itself, thus it is a physical erosion problem. The difference is irrelevant except if you have someone telling you its OK because they have had a synchro sitting in a glass jar of GL-5 for years and it's still ok, so the stuff is good to use. I wasn't aware of the TSB, makes you think about all of the comments here to the effect of "I'm not going to try to outguess the Mitsubishi engineers."

1995 SR, dark blue, cloth seats, flare and cladding delete, upcoming sunroof delete,10 Guage custom skid plates, ham radio