Wrong gearbox oil?

[Nigel]

Questions for Eric if you see this,

I ordered Redline 75w90, the GL-5 version, but failed to get the NS type, my error.

2 questions: Is the NS very much needed in my Beta?
                   My Mazda 6 uses GL-4. Can I use the GL-5 in that?

Thanks!
Non-paying attention Nigel

[peteracs]

Hi Nigel

Eric can give his wise words, but from memory the non NS is designed for diffs, not gearboxes, so do not use it in the Beta.....

Can you return for an exchange?

Peter

[Nigel]

Yes, I can return Peter.
In fact I've already ordered the correct oil!

Nigel

[WestonE]

Hi Nigel, Return it!  The non NS version is for axle units or gearboxes rated for GL5 with no Brass in the Synchroniser assemblies. GL5 oils can attack our Brass synchros forcing a gearbox re-build. We all make mistakes and you managed to not put it into the car.

[Nigel]

Thanks Eric, appreciated.

I've now started the return.
Best,
Nigel