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MG MGA - Oil For Gearbox and Diff

I need to start afresh and change the gearbox and Diff oil in my 1962 MGA as I don't know what oil is in them or how long it has been there.
Can someone tell me what I should be using and also the quantities.

Thanks
George
George Mills

engine 20W50, 4-1/2 US qts with filter change.
Gearbox 20W50 US qts.
Differential EP80W90, 1-1/2 US qts.
Steering rack EP80W90, 6 to 8 FL oz if it was empty.
barneymg

George,

I assume that you still do not have a Workshop Manual.
While you are looking for one you can download a Manual from Barney's website. You just need to download the "General Data" section.
The Manual will give the capacities in Imperial Pints (Australian Pints)

Mick
M F Anderson

Thank you for the info, waiting for manual to arrive.

Regards
George Mills

I believe you should source a GL-4 gear oil, not the widely currently available GL-5. Better for the brass parts.
Gearbox and diff. only.
Brian W.
ZBMan

Brian

Standard MG gearbox oil is (as Barney correctly writes) 20W50 engine oil, not GL.

but if you have a five-speed, then it is 90EP.

Barney omits the capacity of the standard MGA box, which is 2.5 litres

all the capacities are listed in the picture






Dominic Clancy

Great information Dominic.
Thanks
Colyn Firth

Originally the oil in the gearbox was non-detergent type which I still use in my MKII. I don't know why but I am operating on the "an't broke-don't fix" principle.
Keith Lowman

This thread was discussed between 01/04/2018 and 19/04/2018

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This thread is from the archive. The Live MG MGA BBS is active now.