as far as EP additives attacking the coating on the sintered steel synchro rings, I've only ever seen that once in many transmissions I've overhauled... and the first thing to remember is all EP additives are not the same. The only time I saw the "green death" on X19/128 synchros was on a trans that had been sitting around for some time, Ive pulled down transmissions that obviously had EP oil in it (it stinks - you CAN;T miss it) and no sign of green death.
To me it must have been the EP additive breaking down and oxidising, or combining with moisture to form yet another compound, which then attacks the metal, remember we are not talking yellow metals here, thats a totally different story.
A lot of EP additives are Sulphur (or Sulfur for those in the US) based compounds, oxidise them and add some H2O and there a good chance your going to get something aciidic in the process... IMO that's what causes the green death on the sintered metal synchro rings as used in a 128 / X19
The coating on that type of synchro is molybdenum, certainly is on Alfa Romeos, and I have some packets of Goetze synchro rings for Fiats that appear to have the exact same type of coating, and even have "Mo" in the part number.
A new manufacturing process and a new family of composite materials (bronze matrix + friction modifiers) for lubricated tribological systems, such as …
www.sciencedirect.com
SteveC