While browzing the oil section at Auto Zone I found this Pennzoil Synchromesh Fluid. States it meets GM Part #12345349, #12345577, #9985648 and Chrysler #4874464, MS9224. Just wanted to let you guys know. Happy oil hunting. mikeyoilnutt
Pennzoil Syncromesh Manual Transmission Fluid
- Thread starter mikeyoilnutt
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Was this posted Nov 21, 2004, or Nov 21, 2002?
mechtech, I posted this on November 21, 2004. I always cruise different part stores to see what new lubricants are out there. I did not know that Pennzoil offered a sycromesh fluid. mikeyoilnutt
Pennzoil has offered the Synchromesh fluid for some time.
My WC T5 calls for ATF though, so I run a 50/50 mix of M1 synthetic ATF and RP Synchromax.
My WC T5 calls for ATF though, so I run a 50/50 mix of M1 synthetic ATF and RP Synchromax.
MolaKule
Staff member
The original GM/Chrysler spec required the synchromesh fluid to have a 100 C viscosity of 9.3 cSt.
Both the Mobil 1 ATF and the RP synchromesh are an average 7.5 cSt.
If I had a choice between fluids, I would run the RP synchromesh or the Pennzoil Synchromesh anytime over ATF because the latter two have a better AW and EP package than does the ATF. In fact, ATF's usually just have an AW package with little or no EP additives.
BTW, Texaco also has a synchromesh fluid called MTX, as do some boutique gear oil manufacturers.
[ December 02, 2004, 09:48 PM: Message edited by: MolaKule ]
Both the Mobil 1 ATF and the RP synchromesh are an average 7.5 cSt.
If I had a choice between fluids, I would run the RP synchromesh or the Pennzoil Synchromesh anytime over ATF because the latter two have a better AW and EP package than does the ATF. In fact, ATF's usually just have an AW package with little or no EP additives.
BTW, Texaco also has a synchromesh fluid called MTX, as do some boutique gear oil manufacturers.
[ December 02, 2004, 09:48 PM: Message edited by: MolaKule ]
Does this mean I should try Synchromesh in a manual transmission that calls for ATF?
GM used both the earlier non "world class" and the "World Class" T5 transmissions. The non-WC model called for normal gear oil. The WC model calls for ATF, as far as I know.
MolaKule
Staff member
Yes it would be risky for two reasons;
1. Viscosity is higher with GL5's than with synchromesh-type fluids. IE. synchromesh is too thin for differentails.
2. EP package in Synchromeshes is 1/2 to 1/3 of that found in GL5/MT-1 gear lubes. So wear protection is compromized if Synchromesh is used in differential or transaxle speced for GL5.
i think a lot of them miss the fact that the subaru transmission has a hypoid ring&pinion in it. not too many other vehicles are like that. so you might ask them if they would feel comfortable using synchromesh in the rear diff, and if no, then why do they want to in the transmission?
-michael
Agreed. GL5 is usually a heavier gear lube. This synchromesh oil is thinner and specifically for transmissions. If your gear box calls for GL5, there's a reason. Best to do as the manufacturer instructs.
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