[Mgs] 90w in Transmission?

Max Heim max_heim at sbcglobal.net
Mon Aug 4 15:47:03 MDT 2008


In that context, heavier oil would refer to 40w engine oil, not 90w gear
oil. As has been mentioned, the two have different properties, and are rated
using different scales of viscosity.


--

Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires


on 8/4/08 2:14 PM, Bob Donahue at bobmgtd at comcast.net wrote:

> I've always found heavier oil to be helpfull in an old trany with worn
> snycros. Am I wrong?
> 
> Bob Donahue (Still Stuck in the '50s)
> Email - bobmgtd at comcast.net
> Cars:       52 MGTD - #17639
>                71 MGB - #GHN5UB254361
> Member:  NEMGTR #11470
>                NAMGBR # 7-3336
>                Hoosier MGB Club
>                Olde Octagons of Indiana
> 
> ----- Original Message -----
> From: "Richard Ewald" <richard.ewald at gmail.com>
> To: "Dodd, Kelvin" <doddk at mossmotors.com>
> Cc: "MG List" <mgs at autox.team.net>; <mg-mgb at yahoogroups.com>
> Sent: Monday, July 21, 2008 1:15 PM
> Subject: Re: [Mgs] 90w in Transmission?
> 
> 
>> Been there done that.  I would change it.  With the engine cold, even in
>> the
>> summer, the 90W will be too thick for the snycros to work properly.  Ask
>> me
>> how I know this.
>> 
>> I agree that once the trans is warm it will probablly work OK, but I would
>> be worried about eating up the syncros during the time the trans is
>> shifting.
>> 
>> Kevin, 90W is not that much different in viscosity from 30W engine oil?
>> What?  Maybe you have better go try pouring a litttle of each out at room
>> temp.  90W is way thicker.
>> Rick
>> 
>> 
>> 
>> On 7/21/08, Dodd, Kelvin <doddk at mossmotors.com> wrote:
>>> 
>>> Dan:
>>> 
>>> If I had done this to my own transmission, I would just leave the 90W in
>>> it.
>>> 
>>> I'm doubting that you plan on driving the car during the winter, so
>>> unless you find the shifting is really stiff I would not worry about it.
>>> 
>>> 
>>> The 90W is not going to hurt the transmission at all. In really cold
>>> weather, you may find that shifting is slightly stiffer but 90W gear oil
>>> is not that much different in viscosity from 30W engine oil.


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