M/T fluid question

[Bender-san]

So I've got the typical poor 5th gear synchro in my '93 wagon. It is fine when the transmission is cold, and much worse as it warms up. My question is this: Has anyone tried the 75W140 GL-5 fluid instead of the recommended 75W90 GL-5 as a band-aid to synchro replacement? If so, how were the results? My hope is that the heavier fluid will help the synchro from slipping at normal operating temperature, although I must admit I'm a touch worried about how it will handle cold driving.

[Legacy777]

I think I've heard of someone using it, and think it may have helped the synchro issue, but don't recall if he had any cold temp issues.

[Bender-san]

Well I'll guinea pig it and report my findings.

[SUBYLUV871]

I used lucas transmission additive. made mine shift a bit smoother.

[SUBYLUV871]

http://www.lucasoil.com/products/displa ... 9&loc=show

[subydaddy]

I'm currently running 1 qt. MOTUL300 75w90 and the rest Lightweight Shockproof and I've been very happy with it. Have had zero issues when it hits -20.

Had straight MOTUL in it prior......... prior to 2nd gear blowing up (Loaned it to the inlaws )

Also, the straight MOTUL got rid of the 3rd gear grind that the MOBIL 1 synthetic instantly caused.

[kimokalihi]

Interesting. I'm running the 1quart motul300 and red line lightweight shockproof and it didn't help a bit with my shitty synchros. Was a complete waste of about $80 and I spilled it all over my engine bay including on the turbo blanket and that smelled pretty bad for a while.

[AWD_addict]

75W140 seems to slow down shifting, I don't like it. It's more annoying when warm than cold. But you have issues with 75W90, it's time for experiments.

[Bender-san]

I may try a half-and-half blend of 75W90 and 75W140 to start with. I'm not certain I need to suck even more power out of my lackluster 2.2 with the full use of heavier fluid. I should really just buy that EJ22t powerplant I found....