Other British cars, my MGs especially, have always called for 20w50
motor oil in the transmissions, and sometimes 30w is specified as well,
particular for MGAs. I have spoken with various specialists who
recommend Redline transmission/gear oils, some who say to stay away from
synthetics, some who say to use synthetics, and I read at least one
article describing the shear qualities of engine oil and the typical
80/90 gear oils with the conclusion that the ratings, one intended for
engines and the other for gearboxes, actually have the same lubricating
qualities.
Good luck on finding the definitive answer.
My TR6 has whatever the last owner put into it. Smells suspiciously
like gear oil, and the transmission has been one piece of the car that
hasn't given me a problem.
I race my MGA and have gone through all those combinations mentioned
above. I now use 20w50 and everything seems fine.
On 9/30/2010 5:38 PM, Douglas Morris wrote:
> What is the recommended oil for the gearcase/OD?
> My manual says 80/90 hypoid gear oil,
> but an old Britcar mechanic says 30W.
> This puzzles me.
> Any comments?
>
> Doug Morris, NC '74 TR-6 CF-18xxx
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