often referenced is a 'cocktail' used to help with shifting, clashing synchros. This mix is ONLY recommended for Subaru 5spd transmissions that are a little balky. It will not repair a broken transmission. It should not be used in any transmission with a filter. If it is not helpful, go back to using Subaru Extra-S or equivalent.
1qt. Redline Heavy Shockproof + 2 qts. Castrol Axle Lmited Slip 80W-90 + APPROX 1/3 BOTTLE of Pennzoil Synchromesh MTF (1qt. size), after checking level, add more to complete the fill if needed.
more info available at the extensive thread here; http://forums.nasioc...ad.php?t=920674
Posted 11 June 2014 - 09:49 AM
I blew up the transfer gears, center diff, and reverse gear on
my 07 wrx using Scotty's cocktail @30k miles, I can't say it was the
fluid for sure but I do think it contributed to the heat and extra wear.
Personally I only use extra-S now, imho it shifts more smoothly anyways.
The gearbox has held up for 50k more miles after replacing the broken
bits and only using extra-s.
The center diff is sealed so, I don't see how fluid choice could affect
it. Still, no one is doubting you experienced a trans failure - all we
have to go on is anecdotal experiences. i think a lot of people
desperate to get their failing transmission to last longer try switching
fluids. If the trans is failing, vs just having a little clashing due
to stubborn synchronizers, no fluid will save it. Since you experience no problems now with Extra-S , you have no reason to try anything else.
ANY deviation from factory fluids/parts/procedures should be considered 'experimental' - but, that doesn't mean folks have not had good service from different parts/fluids/procedures. Lifting/lowering cars, different coolants, different oil types/viscosities, brake fluids/pads, etc.
Edited by 1 Lucky Texan, 16 June 2014 - 11:45 AM.