Differences in new 3186 movement ?

[jimbo1mcm]

I am trying to understand exactly what changes have been made to the 3185 movement to get the phenominal accuracy in the 3186. It looks like there could be up to a 100% improvement. There have been early reports on this forum of the new GMT, with the 3186, gaining or losing a couple of seconds a week; some spot on, and others less than a second a day. I know there is a new parachrom main spring, but what other improvements have been made? Did they switch to Mobil 1 ?( just kidding, but actually maybe they have changed lubrication protocols). Have they changed gearing or machine parts? Would love to know. Thanks. JPM