Diff oil - EP90

[TimShoubridge]

I need to top up my diff, and I searched the forum to find that EP90 was recommended. Off I trotted to the local motor factor where, as usual, I appear as the bumbling idiot who hasn't got a clue when I'm asked -

"do you want EP90 or Hypoid 90?"

I've bought the EP90 (Comma) Gear oil with a "GL5" stamp on it. Can anyone tell me if this is correct before I fill the diff? or did I need the other one, which is apparantly hard to get.

[GDPR]

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Same stuff Tim - GL5 denotes a high pressure gear oil which is suitable for Hypoid Axles

Russ:dude:

[TimShoubridge]

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Thanks Russ, much appreciated. Seeyou Sunday.

[Arbman Al]

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Following on from Tim's question, can you use the same oil in a manual o/d box?

Rgds....Al

[GDPR]

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Officially if it has been completely drained then you need a Hypoid (EP) 75, GL5 spec, and for top-up use Hypoid EP90 GL5.

You might find that getting your paws on a 75 weight oil will be a struggle, so best compromise would be an EP80.

The lighter weight of oil will give you easier gearchanges when winter is about

[stustag]

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Hi Russ

What about EP80W90?

I used this in my Diff as it was recomended by the local motor factor.

Stuart

[Arbman Al]

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Thanks mate:dude:

See you on Sunday as well!

[Stagdad]

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kryten wrote:

Officially if it has been completely drained then you need a Hypoid (EP) 75, GL5 spec, and for top-up use Hypoid EP90 GL5.

You might find that getting your paws on a 75 weight oil will be a struggle, so best compromise would be an EP80.

The lighter weight of oil will give you easier gearchanges when winter is about

Russ ,But does that mean even more would pi55 out all over my garage floor?

Cheers Steve

[TimShoubridge]

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Stagdad wrote:

Russ ,But does that mean even more would pi55 out all over my garage floor?

Cheers Steve

PMSL.

[Bob Heritage]

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There was an article in the mag a while ago that suggested 20/50 engine oil in the gearbox, it apparently worked a treat. The diff oil should be Hypoy 90GL5 as previously stated

[GDPR]

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Being that the overdrive shares the gearbox oil I would be loath to change to engine oil. The epicyclic gear set in the overdrive and the pump to my mind need something a bit tougher than multigrade.

As to using a "multigrade" Hypoid oil, that make total sense as it will give easier cold changes until the box has warmed up properly.

In the past there have been changes in lube - the LT77 Rover box started out with Hypoid and ended with transmission fluid.......

I would leave our precious Stag boxes as intended with Hypoid.

Russ:dude:

[redstag]

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I use 75w/90 GL5 semi synthetic in mine. Mine isa Morris oilbutyou can get it from Halfords. I found it makes the box smoother in comparison to the EP90.

Before that I did try 20w/50 for a while and it had a similar result but the box seemedslightly noisier.



Pete

[twitchiwobble]

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Dear Tim

The letters "EP" stand for "Extreme Pressure"

Regarding EP90, for Diffs and Manual gearboxes > Although I am still currently using the Triumph Specified EP90, the last two little BMW's that we ran, needed EP80.

Putting a lighter oil in the manual gearbox has been the subject of a few articles in the Mag in recent times. Ifmy Stagwasnot keptin a "warm" garage,but sat outside in sub-zero temps, theneasier cold gearchanges would be a factor to concider and EP80 would help.

On a lighter note, if your transmission currently leaks oil, then, yes, if you put in a lighter oil,..............you get a bigger puddle to mop up!!

[peter oneill]

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hi you need to google this I have read somewhere that GL5 can damage Bronze Bearings found in some gearboxes,not sure but it will pay to check out Peter

[redstag]

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peter oneill wrote:

hi you need to google this I have read somewhere that GL5 can damage Bronze Bearings found in some gearboxes,not sure but it will pay to check out Peter

You need to bear in mind of course that Triumph / BLdid actually specifyGL5.



Pete