The CHEMISTRY of all of this is such that a 90W oil is
usually a differential lubricant. The additives used
in a differential oil will react with any non-steel
components and cause failures. Any heavy trucker will
confirm this if you need extra support. a 20W50 engine
oil is the best for a MG transmission. If you can
find a 90W "gear only" oil that should work as well
BUT avoid anything that claims to be GL rated or
hypoid applicable. This is based largely upon my 27
years experience in lubricant formulation and testing.
JOHN CAHOON
--- mark.jones@exxonmobil.com wrote:
> To: mgs@autox.team.net
> From: mark.jones@exxonmobil.com
> Date: Mon, 21 Jul 2008 14:35:47 -0400
> Subject: Re: [Mgs] 90w in Transmission?
>
> No, 90 weight will not kill your transmission. 90
> weight has a viscosity
> similar to 50 weight motor oil. Although on the
> heavy side, it will not
> kill it. Also, there is nothing wrong with using
> gear oil in the
> transmission
>
> Mark
> 73 MGBGT
>
> Message: 8
> Date: Mon, 21 Jul 2008 06:46:58 -0700 (PDT)
> From: Dan DiBiase <d_dibiase@yahoo.com>
> Subject: [Mgs] 90w in Transmission?
> To: mg-mgb@yahoogroups.com, MG List
> <mgs@autox.team.net>
> Message-ID:
> <796145.78883.qm@web50904.mail.re2.yahoo.com>
> Content-Type: text/plain; charset="us-ascii"
>
> Well, before I put the engine and transmission back
> in the B yesterday, I
> got smart and said, 'Let me fill the transmission
> back up
> with fluid now, while it's easy to get at!'. Good
> idea, but I confused the
> 90w oil for the steering rack with engine oil, and
> filled the
> transmission with the 90w. It's easily-enough
> changed but am wondering if
> the 90w will kill the (non-OD) transmission or if I
> really
> need to change it?
>
> Thx....
>
> Dan D
> Central NJ USA
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