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Title: Gearbox oil Post by: JohnBM on May 14, 2021, 03:11:39 PM I will be changing the gasket on the gearbox shortly & normally use Castrol oils for engine etc . What do others use , if using Castrol ? There’s a castrol universal 80/90. For manual transmissions . The GMH manual shows straight run mineral oil SAE 90 . I’m probably worrying about nothing . Cheers John .
Title: Re: Gearbox oil Post by: Errol62 on May 14, 2021, 08:07:14 PM Just using gulf western 80/90 with 20% Morey’s heavy duty oil stabiliser.
Sent from my iPad using Tapatalk Title: Re: Gearbox oil Post by: JohnBM on May 17, 2021, 01:18:52 PM Thanks Errol , I see you use Moreys as well , good to see . It seems that using 80/90 oil is the go & whatever brand is a personal choice . Thanks for reply .cheers John.
Title: Re: Gearbox oil Post by: Errol62 on May 17, 2021, 08:08:12 PM 👍👍
Sent from my iPad using Tapatalk Title: Re: Gearbox oil Post by: Trevor_B on May 18, 2021, 01:35:12 PM Hi John,
If you want a direct replacement for the GMH Oil then use Penrite Transoil 90: https://www.penriteoil.com.au/products/transoil-sae-90 ($2) It is a straight SAE90 Mineral Oil. It is important not to use multi grade or friction modified oils in grey gearboxes as they can impact the function of the syncromesh engagement. Cheers, Trevor_B |