I'm happy to report that 1 qt of royal purple synchromesh and ~1.2 qts of redline fixed my 3rd year grind when cold issue. Shifts are much smoother too!
I have a 2010 with 35k miles on it. It started grinding when cold about 2-3k miles ago.
-2010 Phantom Black Exige S240 [Kold-fire Custom Tune] [RLS 3.0"][RLS IC, IC pipe, IC shroud, Heatshield] [RLS sidescoop kit] [Saiku Michi Catch Can] [Walboro 255][BWR De-cat] [BOE 1/4 Stick] [TRD Intake] [Jim Clayton's Tow Hook] [CF Splitter, Sideskirts, Sidescoops, Wing Blade, Gas Cap]
-1995 Whitest White RHD Subaru Impreza STi type RA ver. II
-1976 Toyota Celica GT