Pennzoil Syncromesh vs. GM fluid vs. GM w/ FM

[vinu_neuro]

Since Pennzoil/GM/AC Delco Syncromesh is such a highly praised mtf across a variety of vehicles, I figured I might as well give it a try to help a notchy 1-2 in my Prelude. I'd appreciate a few clarifications before getting it since there's a big price difference between Pennzoil and the GM oem fluid:

-Are the Pennzoil and GM oem fluid's identical formulations?

-GM Syncromesh with Friction Modifier is the one that typically gets raving reviews. Afaik, friction modifier is only needed in clutch-type diff's and actually compromises syncro performance. Is there any difference between this and the regular Syncromesh apart from added FM? If not, am I right in assuming the non-friction modified mtf should automatically perform better in gear changes?

PS: I've been using Amsoil mtf the last 50 miles and while it's helped some, the notchiness is still very there. If the Pennzoil mtf is the same as GM oem, I don't mind trying it since it's around ~$5 a quart.

Thanks.

 

[oggb]

I believe the Synchromesh "FM" is the product that you're looking for.

Keep in mind that Synchromesh is much like a 20-weight engine oil. I'm not sure what your Prelude calls for but I know many honda manual transmissions utilize 30-weight engine oil as the lubricant.

 

[vinu_neuro]

Why do I want Friction Modified GM Syncromesh better when friction modifiers are said lessen syncronizer braking performance?

I'm not concerned about the viscosity. Syncromesh is in line with the current oem mtf (between old and current fluid) and people had been long using it successfully even with the previous ~11cst fluid.

 

[mechtech2]

vinu -
You can friction modify a fluid in BOTH directions.
Good tranny fluids are friction modified for better grab of the synchros.
Diferential fluid can be modified for better slip of the clutches.
Most ATFs are modified to slip a bit, too. [they have clutches]

Pennzoil synchromesh is great, but is a dino fluid.
Many use Redline or Amsoil which are full synthetic.
There are different versions of the GM stuff. One is identical to the Pennzoil . There is a more rare full synthetic version available at GM.

I had the Amsoil MTF , and it was very good. But My tranny likes the new Redline MT 85 better. [It's a bit thicker and has very good synchro friction modification]

 

[unDummy]

Friction modified... maybe we should start using the term "traction modified"

Its about a timed 'smooth' engagement as too abrupt wouldn't be too good either. Everyone wants instant shift and that isn't possible unless you enjoy shift clunks. Grinding is just the reminder that you're shifting too fast. Throttle blips on downshifts eliminates most of the downshifting complaints. On upshifts, don't expect a shift to complete if engine RPM drops slowly(usually for emissions). Get that lightweight flywheel to make it easier to upshift, or aftermarket tune that lets RPM drop more rapidly during upshifts.

Fluids are a bandaid. Some makeup for the transmission and some makeup for the lack of driver skill.

 

[aquariuscsm]

I`ve figured the FM version was for fwd cars that share the tranny/differential?

 

[MolaKule]

Quote:
Are the Pennzoil and GM oem fluid's identical formulations?



They are very different in terms of base oils used and additive packages.