Author Topic: Oil Question  (Read 1163 times)

Online Greybeard

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Re: Oil Question
« Reply #15 on: 12.04. 2017 13:02 »
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Are you sure that you use EP90 and not EP80 in the G'box?
EP90 is back axle oil, EP80 is normally G'box oil.


You might be right; I was working from memory; I'll check the bottle tomorrow.

I'm using Halfords EP 80w/90 GL-4. 'Suitable for all manual gearboxes where an SAE80W/90, API GL-4 grade is recommended'

Will someone please let me know if that is unsuitable for my gearbox.  *conf*

Offline bikerbob

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Re: Oil Question
« Reply #16 on: 12.04. 2017 13:26 »
I have been using that same Halfords oil in both my A7 and A65 gearboxes for some years now without any problems.

Offline RoyC

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Re: Oil Question
« Reply #17 on: 12.04. 2017 14:59 »
More confusion.
In the owners hand book, (P32), "A mineral type of oil should be used, of the same grade as that specified for the engine.
G'box is 14 fl oz (398cc)."
So the handbook says use the engine oil.
In old cars I've always used EP90 axle, EP80 g'box and whatever engine oil was available.
My bike is a 1958 A7SS
Staffordshire UK

Online JulianS

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Re: Oil Question
« Reply #18 on: 12.04. 2017 17:20 »
EP gear oil comes in various specifications, some of which may not be suitable for use in our gearboxes. Perhaps best to weigh up the pros and cons and make your own choice  - GL5 or GL4 gear oil for example. Lots of opinions out there.

Currently using Morris 20/50 with inline Morgo filter for engine, Morris 20 in forks and chaincase and Halfords 80/90 EP  GL4 in gearbox.

Works fine for me over many miles, but as always the choice is yours.

Online trevinoz

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Re: Oil Question
« Reply #19 on: 12.04. 2017 22:19 »
Roy, the handbook is out of date.
Look at the handbooks for bikes in the 70s which were for virtually the same machines and you will find multigrades and EP oils recommended.