GM synchromesh and your o2m tranny

[Red90]

Re: GM synchromesh and your o2m tranny

Something is different about measuring gear oil weights and engine oil weights (can't remember what). But a 75w/90 gear oil is equivalent to a 15w-ish/50-ish weight engine oil.

I'm well aware of viscosity ratings. That is very thick. The GM syncromesh is a 75W-80. Basically 1/2 the viscosity of a 75W-90.

[BaggedGLI]

Re: GM synchromesh and your o2m tranny

I'm well aware of viscosity ratings. That is very thick. The GM syncromesh is a 75W-80. Basically 1/2 the viscosity of a 75W-90.

Factory fluid for the 02M is 75W90.

[Mcrow]

Re: GM synchromesh and your o2m tranny

Factory fluid for the 02M is 75W90.

Same with 02A and 02O (Side note). Pretty sure almost all VW manual transmissions are recommended to have 75W/90.

[BaggedGLI]

Re: GM synchromesh and your o2m tranny

Same with 02A and 02O (Side note). Pretty sure almost all VW manual transmissions are recommended to have 75W/90.

True facts.

[whtrabt]

Re: GM synchromesh and your o2m tranny

Love it, it's goin down this weekend

How did it go? I'm looking at doing this in my GLi soon and was reading MT-90 was a favorite. Would like to hear your first hand experience with the GM stuff

[idlandk]

Re: GM synchromesh and your o2m tranny

I put the mt-90 in my 02M and had it in there for a week because it felt worse than the old oil that was in it. I bought syncromesh from GM and it felt much better so It's in all my cars now. I wouldn't say that it fixes any gears like some people have said because nothing is going to magically fix your worn syncros I dont think. No experience with Motul but I think its a lot more expensive.

[145117]

Re: GM synchromesh and your o2m tranny

who's got the best price on it these days?

[onceover]

Re: GM synchromesh and your o2m tranny

Got mine through Popp when he still worked at Matrix Motorsports. May be worth sending him a PM

[Red90]

Re: GM synchromesh and your o2m tranny

Factory fluid for the 02M is 75W90.

That is what VW states, but it is not what VW puts in the boxes. The 052 lube they supply has been tested to be a 75W80, despite the 75W90 labelling and that is why Redline MTL and GM synchromesh work well...

[xJarodx]

Re: GM synchromesh and your o2m tranny

How did it go? I'm looking at doing this in my GLi soon and was reading MT-90 was a favorite. Would like to hear your first hand experience with the GM stuff

Didn't get aroud to it, things came up, going to definitely get it done while the Chinook is here and it's not -27.
Will report back when she's all done.

[xJarodx]

Re: GM synchromesh and your o2m tranny

who's got the best price on it these days?

Can't remember off the top of my head how much it was, but I bought it from GM directly and it wasn't that expensive.

[witchcraftz]

Re: GM synchromesh and your o2m tranny

Synchromesh is about $10-$20/ bottle from GM dealership, and I also agree it works great.

[whtrabt]

Re: GM synchromesh and your o2m tranny

I just did this yesterday. Made a noticeable difference, tranny feels smoother now. I got it from Shaw GMC and was on sale for $10. It's usually $15. From the research I did I got the one that was friction modified apparently its better then the regular syncromesh fluid.

Also if you need the tamper proof triple square for tranny drain plugs princess auto only place I could find them.

[witchcraftz]

Re: GM synchromesh and your o2m tranny

Glad to hear it worked.

[owen]

Re: GM synchromesh and your o2m tranny

VW may say they spec 75W90 but after changing from G050 to the G052, the spec'd oil tested more like an ATF.

Interesting read here:
http://forums.tdiclub.com/showthread.php?t=132884

Summary list of oils and their properties:

VI..Vis@40C..Vis@100C

128..159.0 18.3 = AMSOIL CTL SAE 50 Powershift GL-1
..............16.7 = Motul MOTYLGEAR 75-90 GL-4/-5
..............15.6 = VW G50/G51 GL-4
185..90.0..15.6 = Redline MT-90 75-90 GL-4
..............15.2 = Mobil 1 Synthetic 75W-90 GL-5
222..72.6.15.2 = Motul Gear 300 75-90 GL-4/-5
..............15.0 = Elf Tranself Synthese FE 75-90 GL-4/-5
132..116.0..14.9 = AMSOIL AGL 80W-90 GL-5
177..84.5..14.7 = AMSOIL MTG 75-90 GL-4
133..76.2..11.0 = AMSOIL CTJ SAE 30 Powershift GL-1
183..56.2..10.6 = Redline MTL 70-80 GL-4
194..47.1..9.6 = AMSOIL MTF Synchromesh Trans fluid (GM/Chrysler) None
208..41.6..9.08 = Penzoil Synchromesh trans fluid None
198..34.0..7.5 = Redline D4 ATF Dexron III / Mercon / API GL-4
138..40.5..7.1 = AMSOIL CTG SAE 10W Powershift GL-1
..... 31.2..6.5 = VW G-052-171-A2 None (Synthetic)
..... 35.1..6.38 = VW G-055-726-A2 None
..............6.3 = VW G52 (part numbers G052726A2 / G05272601) None (Petroleum)

As you can see the VW fluids are very light when hot, which is why people in warmer climates complain of notchy shifting.

I personally run a 50/50 of Gear 300 (highest VI and pour point of -60) with oem G070 giving me something around a Redline MTL.

A lot of people seem to have good luck with the new Synchromesh fluids as they have GL-4 additive packs with good base stocks, some have reported success with the new friction modifier synchromesh fluids as well.

Bottom line, just get a high quality manual trans oil with GL-4 rating, something lighter on the scale if you park outside in -30 weather....