Using GL-5 on borg warner synchros fine splinned tranny.

[76dailydriver]

I've seen here in the board before that you can use GL-5 on a borg warner fine splinned tranny. Just can't find it anymore. Is there any truth to this? Looking for something locally for GL-4 is a treasure hunt. If not i'll just use HD 40wt until i can place an order online for mtl80. Thanks in advance...

[Roland]

No treasure map required.

 

If you believe what is printed, Mobil1 Syn Gear Lube LS 75W90 has a GL5 rating, but allegedly is safe and even protects yellow metals. 

 

 

Quote

Excellent rust, staining and corrosion protection of copper and its alloys.   https://www.mobil.com/en/industrial/lubricants/products/mobil-1-syn-gear-lube-ls-75w90

 

 

 

That said, there are plenty of other alternatives, from Amsoil, Redline and even the ubiquitous Staylube.

 

Amsoil:

Quote

Answer: Yes. As long as temperatures don’t exceed 250°F (121°C), all AMSOIL automotive gear oils are safe to use in drive train applications with yellow metals. Check the AMSOIL on-line look-up guide at www.amsoil.com for specific questions. https://www.amsoil.com/frequent.aspx

 

 

" Less Slippery Low Sulfur Formula Compatible With Brass Synchronizers "

]

 

 

Edited August 4, 2019 by Roland

[iinca]

I thought Sta-Lube was for something totally different....

[jimk]

Performed a few years back but there are lots of properties of a gear lube.  For your reading (or weeping) pleasure, depending on what brand you smoke.

 

G2457 Gear Lube White Paper.pdf

[TG2k2]

Performed a few years back but there are lots of properties of a gear lube.  For your reading (or weeping) pleasure, depending on what brand you smoke.
 
G2457 Gear Lube White Paper.pdf

What’s all the talk about 3 and 4-ball load tests...?

[Mike Self]

My 73 had the B-W synchro tranny, as does the E21 5 speed, and I've been using Red Line MTL for many years with no problems.  The 4 speed was definitely notchy--noticeably more so than the Porsche-synchro gearbox in my '69, but switching to MTL cured the notchiness completely.

 

mike

Edited August 4, 2019 by mike

[jimk]

1 hour ago, TG2k2 said:

What’s all the talk about 3 and 4-ball load tests...?

Std test for load capability.

But if it'a about you, I dunno.

[TG2k2]

Std test

I never would have guessed this was heading in THAT direction. I thought we were a group of car enthusiasts...?