Lancia Beta Forum

Technical stuff => Transmission => Topic started by: Nigel on August 17, 2026, 04:59:38 PM

Title: Wrong gearbox oil?
Post by: Nigel on August 17, 2026, 04:59:38 PM

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

Title: Re: Wrong gearbox oil?
Post by: peteracs on August 17, 2026, 09:16:48 PM

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

Title: Re: Wrong gearbox oil?
Post by: Nigel on August 17, 2026, 10:05:52 PM

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

Nigel

Title: Re: Wrong gearbox oil?
Post by: WestonE on August 18, 2026, 06:43:19 AM

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.

Title: Re: Wrong gearbox oil?
Post by: Nigel on August 18, 2026, 08:10:13 AM

Thanks Eric, appreciated.

I've now started the return.
Best,
Nigel