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Username Post: Synchromesh Oil in an Older Trans?        (Topic#374039)
Senior Member
Posts: 1930

Loc: Whitewater, CO
Reg: 05-25-01
11-19-23 10:42 AM - Post#2864280    

I am getting my 2wd RWD Nissan trans rebuilt. The Spec for the oil is 90w GL4. Is that outdated?

Honda has called for a Synchromesh type oil since the 90s and they say that you can use 10-30 oil, in a pinch. GM has called for Synchromesh oil, in their manual transmissions since the 90s also.

A FWD car uses ATF for the Differential portion of the transaxle.

Are there now better choices than GL4 gear oil?


Valued Contributor
Posts: 3184

Loc: Lake George, NY
Reg: 11-11-15
11-19-23 12:12 PM - Post#2864281    
    In response to Stinky

What is the rebuilder recommending?

Senior Member
Posts: 1930

Loc: Whitewater, CO
Reg: 05-25-01
11-19-23 09:20 PM - Post#2864295    
    In response to Shepherd

He is checking on it. He didn't make a recommendation.

I've posted on some Nissan forums and so far it seems that there are some guys out there that have been using it w/good success.

Edited by Stinky on 11-19-23 09:26 PM. Reason for edit: No reason given.

Dedicated Member
Posts: 5617
Loc: Lake Superior-Michigan US...
Reg: 03-30-00
11-22-23 01:37 PM - Post#2864371    
    In response to Stinky

Here is a GL4.
Manual Transmission & Transaxle Gear Lube 75W-90 GL4

Synchromesh type oil is equivalent to a 5W-30 engine oil in viscosity for manual transmission gearbox applications in certain General Motors and Chrysler vehicles with synchronizers..

GL-4 gear oils are typically recommended for spur and helical gears found in manual transmissions and transaxles operating under moderate speeds and loads.

GL-5 gear oils are typically recommended for hypoid gears in automotive axles operating under high-speed, high-load conditions.

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Super Senior Member
Posts: 6461

Loc: paradise
Reg: 09-05-03
11-23-23 09:47 AM - Post#2864419    
    In response to Stinky

pretty much depends on running conditions. like light or heavy use. hot or cold climate.

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


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