As the title states, Awhile back someone suggested I should run Synchromesh Fluid instead of the FSM suggested 10w-30. Todays 10w-30 isn't the same as it was with the additives back in 1986, so with that in mind, is it any kind of beneficial to run a brand of Synchromesh vs The usual? Does anyone have any input? I ran Valvoline Synchromesh for 40,000 miles before draining it when throwing in a new clutch kit and noticed unlike the changes of Castrol oil before, the Synchromesh fluid still looked almost new. Bear in mind it came out of a shorter final drive geared transmission that had been daily driven @3,800rpms at 70mph for at least 10 miles daily. Pros and cons anyone? Bad experiences?