[Mgs] 90w in Transmission?

[Bob Shaw]

Not so sure about that. Many older manuals called for 30 Wt oil. Last  
I knew, so did John Esposito (appologies if I did not spell that  
right) of Quantum Mechanics. There seems to be some variance on that  
among experts.
Bob Shaw
shaws at mlcltd.com
My MGA is not leaking,
It is merely marking its territory



On Jul 22, 2008, at 4:01 PM, Simon Matthews wrote:

> Stuart,
>
> You should consider changing that oil for MT90. If you look at Redline
> Oil's website, you will see that MTL is equivalent to 5W30/10W30
> engine oil, which is slightly thinner than the recommended 20W50. MTL
> is slightly thicker, although still not quite 20W50.
>
> I use MT90 in my MGA, although I originally used MTL. I can't say that
> I noticed a difference when I changed to MT90
>
> Regards,
> Simon
>
>
> On Tue, Jul 22, 2008 at 12:45 PM, Stuart MacMillan  
> <macgroup at comcast.net> wrote:
>> At least you don't have an OD tranny, but it would probably work  
>> sort of
>> okay there too.  90w gear oil makes is harder to shift because the  
>> synchro
>> rings have a thicker, slipperier layer of oil between them and the  
>> cone on
>> the dog gear.  I think the ears on the rings will wear faster the  
>> harder you
>> have to shift
>>
>> At the risk of igniting flames, I've used Red Line MTL for over 13  
>> years in
>> my '65 with OD, and for 5 years in my daughter's '71 GT, also with  
>> OD.
>> Great stuff. Shifting is quicker, OD works great, and you never  
>> have to
>> change it.
>>
>> Stuart
>>
>>
>>
>> -----Original Message-----
>> From: mgs-bounces+macgroup=comcast.net at autox.team.net
>> [mailto:mgs-bounces+macgroup=comcast.net at autox.team.net] On Behalf  
>> Of Paul
>> Hunt
>> Sent: Tuesday, July 22, 2008 1:03 AM
>> To: MG List; mg-mgb at yahoogroups.com
>> Subject: Re: [Mgs] 90w in Transmission?
>>
>> This is a fallacy.  Factory V8s have 90 gear oil as standard, mine  
>> was a
>> daily
>> driver parked outside for many years including periods of below  
>> freezing and
>> I
>> never had a problem, but I can't speak for the condition of anyone  
>> else's
>> gearbox.  As long as it *is* gear oil, and not *differential* oil  
>> it should
>> be
>> OK, don't junk it now just wait and see how you get on.
>>
>> PaulH.
>>  ----- Original Message -----
>>
>>
>>  ...  With the engine cold, even in the
>>  summer, the 90W will be too thick for the snycros to work  
>> properly...
>> Mgs at autox.team.net
>> http://autox.team.net/mailman/listinfo/mgs
>>
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