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MG Midget and Sprite Technical - Diff Oil. Can't find any EP90

Hi,

Replacing the Differential Oil, in my 1974/RWA/1275

I couldn't find any Hypoy B EP90 (as per manual). Local shop has Castrol EP 80w-90 (API GL4), is this close to what I need?

Thanks Mark
m Marston

Mark,

That will be ideal. The multigrade EP oil was introduced to give a better 'cold' gear change on gearboxes than use an EP oil. Works perfectly well in diffs too.

Richard
Richard Wale

Thanks Richard.
ttfn
m Marston

hang on, shouldn't you use engine oil in A series gearboxes?

EP oil is bad for the box isn't it?

matt
Tarquin

If he was changing the gearbox oil he may consider that, however he is changing the diff oil!
:-))

Too much pop Tarq?
Bob (robert) Midget Turbo

I was referring to the

"The multigrade EP oil was introduced to give a better 'cold' gear change on gearboxes than use an EP oil. Works perfectly well in diffs too."

Could imply that is suitable for use in our boxes. I'm sure a lawyer would agree with that statement.

No pop for me, just chocolate orange, tea, and vehicle costing spreadsheets.
Tarquin

Tarq,
It was supposed to indicate that the multi-weight oil was created for the sake of the gearboxes THAT use it. No indication on A-Series boxes, although you have to watch that Bob character as he tends to think in terms of those torquey 1500 midgets ;-). I suppose it would work well in one of those Triumph boxes...

The point of multi-weight is not that it affects the normal working viscosity, but rather that it maintains the same viscosity over a wider range of temperatures, allowing it to acr "normal" from a much lower temperature, rather than being very thick when starting out.
David "my oil is still a little thinck..." Lieb
David Lieb

The temperature advantages are not lost on me. My poor garage heater is not coping well with this inclement weather, for that matter neither am I.
The book says a 1 ltr, but the the diff took about .75 before overflowing. grrrr. I'm sure those Layland boys designed that filler point to be as awkward as possible. Grrrrr.

M
m Marston

Matt,

'For the sake of clarity' EP oils of any description should not be used in an A-Series gearbox. Good quality engine, as specified in the manual only.

Richard
Richard Wale

20/50w to be exact for the gearbox, BUT...I found massive inprovement using 1/2qt of lucas oil trearment add to the oil for the gear box....makes them run and shift much smoother / quiter and cooler....but you need to run the tranny at leaste hr. per week to keep the mixture well combined....I also found by combineing the oil and lucas togather 1st then heating it up a bit before adding to the gear box made it much easyier to install....

prop
Prop

This thread was discussed on 23/03/2008

MG Midget and Sprite Technical index

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