Synchromesh trannies/friction modifiers a no no.

[aquariuscsm]

I emailed Redline about their Shockproof gear oil. They said in their email back,that any gear oil with friction modifiers should NEVER be used in synchromeshed manual transmissions (which Shockproof contains).

Just thought I`d pass it along.

 

[MolaKule]

I'll repeat this again:

Quote:
Differential lubes use friction modifiers to reduce mechanical and fluid friction and add some anti-shudder friction modifier for limited slip, both very different chemical compounds.

Manual Transmission fluids use a different friction modifier for synchro engagement, a modifier that does NOT contain the same chemicals as differential lubes.


I do not recommend using ANY differential fluid in light truck and car Manual Transmissions.

 

[Pablo]

Originally Posted By: aquariuscsm
I emailed Redline about their Shockproof gear oil. They said in their email back,that any gear oil with friction modifiers should NEVER be used in synchromeshed manual transmissions (which Shockproof contains).

Just thought I`d pass it along.


I really dislike it when lube companies (almost all of them) use the term "friction modifiers" so loosely. Taken literally that is terrible advice. But as Mola says, of course you don't want diffy fluid in most transmissions.

 

[aquariuscsm]

Yeah,it seems like anytime I`ve ever emailed any of the oil brands (Mobil,Royal Purple,Redline) wanting to gain some educational knowledge about their products,they just say "Yeah use it" or "No don`t use it". They never say why it is a "yes" or a "no". They almost sound like a generic automated response software system or something.