RB25 Neo transmission break in

[NickER34]

Anybody have any recommendations of gear oil to use for break in period? I heard of people using Redline MT-90 but curious if people have any other opinions. The transmission is brand new from Nissan.

 

Cheers.

[BK]

Castrol VMX or VMX-M mineral oil

[joshuaho96]

Wasn't there a guy that mentioned having issues with running synthetic gear oil during the break-in period?

[admS15]

The gearboxes come pre filled with Castrol vmx from Nissan. Run it for a couple thousand k's with that and then change to whatever flavour of gl4 gear oil you prefer.

[GoHashiriya]

On 4/8/2022 at 3:15 PM, joshuaho96 said:

Wasn't there a guy that mentioned having issues with running synthetic gear oil during the break-in period?

Maybe me. Transmission started whining after 3k kms at a track day.

I used the factory-filled stuff for run-in, then changed to fully synthetic Syntrans "GL4+" 75W-90 (TAF-X) at about 800kms. When my new box comes I plan to just use the Nissan GL4 75W-85 consistently. 

[BK]

On 08/04/2022 at 6:17 PM, GoHashiriya said:

Maybe me. Transmission started whining after 3k kms at a track day.

I used the factory-filled stuff for run-in, then changed to fully synthetic Syntrans "GL4+" 75W-90 (TAF-X) at about 800kms. When my new box comes I plan to just use the Nissan GL4 75W-85 consistently. 

That's because you can't get the good one in Japan, being Syntrans 75w-85 GL-4.

To be honest there's nothing wrong with vmx full time, just change it more regularly. One of the Rs we're just sticking with that - VMX-M gl-4 at $50 per 4 litres.

[r32-25t]

I’ve also seen synthetic gear oil destroy an s15 box