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Re: Tranny Oil again (Sorry)

To: Larry Macy <macy@bblmail.psycha.upenn.edu>
Subject: Re: Tranny Oil again (Sorry)
From: neil.cairns@virgin.net
Date: Fri, 28 Aug 1998 19:03:40 -0700
Larry Macy wrote:
> 
> I know this has been gone over before but usually I didn't have a need
> for it.
> I am planning on changing the lubricant in the tranny of my 78 Midget. As
> I recall the consensus of opinion (if there is such a thing on the list)
> was to go with 20w50 engine oil. Now the MG Manual (factory issue) says
> 90wt for any driving where the temp is above 10F.
> 
> Thoughts??
> 
> I need to pull and rebuild (bad synchros) but I want to get a few more
> weeks of driving before the weather goes cold.
> 
> Larry Macy
> 78 Midget
> 
> Larry B. Macy, Ph.D.
> macy@bblmail.psycha.upenn.edu
> System Administrator/Manager
> Neuropsychiatry Section
> Department of Psychiatry
> University of Pennsylvania
> 3400 Spruce St. - 10 Gates
> Philadelphia, PA 19104
> 
> Voice mail 215 662-2890

According to my manual......The 1500 Midget has a 'Triumph' engine and (
Marina) gearbox. This gearbox uses 1.75 pints ( UK pints) of EP 90 gear
oil. The earlier BMC gearbox fitted to the 'A' series Midgets uses
engine oil, 2.25 pints of 20/50. If you use ordinary engine oil in a
gearbox that has gear teeth cut so they require EP ( extreme pressure)
oil, you will ruin it very quickly.  Neil

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