Schaeffers Moly E.P. Oil Treatment #132?

[Dave]

My Subaru WRX's transaxle's synchros could use some help. The transmission in these cars is notorious for being notchy. I've heard that Schaeffer's #132 will help the synchros grab better with good EP properties.

Sounds like the perfect match for the WRX's transaxle fluid which houses the transmission and front diff where Subaru recommends a GL-5. Can anyone confirm that it's safe to use? I'd love to use RedLine MT-90 in this transaxle for it's shifting properties, but wouldn't use a GL-4 with the diff sharing the same fluid.

Thanks,
Dave

 

[MolaKule]

Unless you want to thicken up gear oil, and I can't imagine why if you have the correct viscosity of gear lube, then you will not gain anything by using #132.

#132 is primarily for beefing up engine oils.

 

[Dave]

Thanks for the input. I recall seeing a couple posts from people who added some 132 to their transmission and it helped their synchros engage better for some reason. Given that the synchros in the WRX transmission are a more stubborn than most, I figured it might be worth trying.

 

[Bror Jace]

Dave, I pretty much agree with what MolaKule said. VOAs of this stuff show that it has some additives benefecial to motor oil, although it seems to have been formulated when molybdenum was very rare in PCMOs. I question its effectiveness right now.

After talking about it here for a while, I think the only way you will find out for sure is to try it in the transmission. Synchromesh gearboxes are very finicky and individualistic. It's really hard to predict what will work well. Just be prepared to drain it ASAP if it's not working out.

Let us know how it works if you try it ... and even if shift quality is decent, consider doing a used oil analysis.

--- Bror Jace