Gearbox oil.

[wimpus]

Hi all.

I've been using Millers 80w90 gl4 oil for Fox her gearbox/overdrive /diff for years now.

But as I nearly cant get it here anymore, so I was searching.

 

Seems Triumph said to use SAE 90 gl4 oil..

So whats the best ?  80w90 or SAE90 ? 

 

Wim

[Nigel Clark]

I use this EP80w90 GL4 from Comma for my Triumph gearboxes and diffs:

https://www.ebay.co.uk/itm/372411853071?epid=249087511&_trkparms=ispr%3D1&hash=item56b579e90f:g:ND4AAOSwakxdTVLr&amdata=enc%3AAQAFAAACgBaobrjLl8XobRIiIML1V4Imu%2Fn%2BzU5L90Z278x5ickk8ihYa55VeJusc0Ydu6jng2ebyMdY7Au5V7BhxHe3wpYk8sjpksKnqnximHdpDwWERJ9WWSQi6Yqrz7aWXiNLG3G19tVSiAJ2%2FdtPE2Y8gUIJJAtqjXb1hSlpcxz01JXJ8LM9L66T4cV3F8rtJwlWn34vw6MPhc9oP%2BzksO9GaCa1Fe0WfFhVSzGDyz20qZyFJJfo2f1RA9e%2B4%2BZG8gNDQUPcSDW3lDBhHyKaN6jenUQlktMXZr%2FDqTmZCfEh4K5rZapN7g8ZwDImDk8rAd5aw1jENYhqEDKe9s1ax6XrtV1QdUG6ahCa8HBTECCXtPcZyO6l0hagU2MLyW1cGUMRz3aT%2B%2BMWpWrfn6cTJL3YfsBuWF5DPotL37mM5firJkOhCHmaj8ptv5v78fzrkvKjZ0G5WmI38orm%2FcEVUdorCeblNjx0%2FsztnmzZ%2BxoquZr24dPpYUSH6kVM5%2Fhd%2BwEO%2BQfZ1ajQycU5WWjVz1vp9Ay1GJvddonY%2BHh%2Fo4%2FVMKlvaCvMWTfJ1dNOHgBro51uLkWq6papDiH2%2B4Nqp%2B1%2BO12QGfsX%2BnGGajBYV6%2BqoJgVLkIb%2BfbWBHqfDKvhHDWqyyba7PoW4LCEN64m2iUIhrGZ2cVPFVKySeYYWHx8VkIImkEC%2BYiHu4VDheBQSxjOWZFCf9puOl5BxcE5cPVnFPv%2BBfAqPf7er97DxXYR96tdf%2BqGQ7wSTudfMpZ47vmcyQZv3yakNLbegoXGNlXwaNNaMg1LRU3kkjFOr6oy55edbqRvnJ%2FjhqXCrdq6gQ076DqoG969b%2FV5Jw5QuSt3ZF4%3D|cksum%3A3724118530710beef2f6ef5a4f4dae71523d1675f60a|ampid%3APL_CLK|clp%3A2334524

Halfords also list similar, for those in the UK (probably supplied by Comma):

https://www.halfords.com/motoring/engine-oils-and-fluids/gearbox-oil/halfords-gear-oil-ep-80w%2F90-gl-4-1l-724443.html

Nigel

[Colin Lindsay]

I've been using Millers, probably because it's stocked locally:

https://www.ebay.co.uk/itm/311778001209?hash=item48976ac139:g:c6UAAOSwjYldly-T

[Pete Lewis]

the triumph spec was probably written before the days of multi grade EP oils 

if you want a quieter Diff use a EP140 .  not/never  for the gearbox 

Pete

[Gully]

According to the Courier mag, the Club Shop is still posting to Europe - last time I looked they supplied Penrite and Castrol Classic.

Gully

[Paul H]

Can EP 80 / 90 be mixed with EP 90 ? 
How often should gearbox  and overdrive oil be changed ? 
Thanks

Paul 

[Clive]

15 minutes ago, Paul H said:

Can EP 80 / 90 be mixed with EP 90 ? 
How often should gearbox  and overdrive oil be changed ? 
Thanks

Paul 

No real reason why not. I saw some guidance that said fill with 80, top up with 90. Or the other way round....

Gearbox and diff are "for life" but that is not really wise. Maybe every few years? depending on use. 

[PeteH]

23 minutes ago, clive said:

Gearbox and diff are "for life" but that is not really wise.

Is that why I have a diff; without a drain plug?. If I want to change it I have to use a Pump. Or. I suppose, be prepared to remove and split the diff?. Or turn the car on it`s side?.

Pete

[Pete Lewis]

the reason for no drain plugs is there are no contaminants to degrade the oil like that of an engine 

thats over its designed  life , all ours have surpassed that , so if you want to change it feel free 

Pete

[Clive]

44 minutes ago, PeteH said:

Is that why I have a diff; without a drain plug?. If I want to change it I have to use a Pump. Or. I suppose, be prepared to remove and split the diff?. Or turn the car on it`s side?.

Pete

Yes, no drain plug for that very reason. 

But they do benefit from the occasional, or even regular, oil change. Metal is shed from the gears (one chap reported using a magnetic filler plug that collected more steel shards than a magnetic drain plug)

I would be inclined to use a suction gun or similar to suck the old oil out, maybe a magnet to help remove steel bits. Then refill with some nice fresh oil. using a magnetic filler plug appears to be a good idea too.

If the car is used hard/fast and long journeys, the oil will degrade from heat, especially as most people are using mineral oils as opposed to synthetics which are longer lived. I can also see no reason not to use a GL5 oil in the diff, as long as it is yellow metal safe. (most are these days)

[wimpus]

Been looking up..

Found 2 brands that I like and GL4 spec. (Pic below)

Millers can be bought in Belgium (there is an dealer in the Netherlands), but a bit costly now.

I change my gearbox oil once a year, sometimes 2 times.

As I do 25.000kms/ year.

The diff, got a drain plug installed in that.

So once a year I drain the oil of the diff.

Maybe not needed, but for that 600ml of oil..

 

 

 

[thescrapman]

Both look suitable, assuming the Valvoline one is GL4.

[GT6M]

Wimm,  try the 80/140 stuff, get it 2.5 litre cans

will be fine for the GB an Diff

esp the Penrite pro gear oil,

fully synt, dus,nt go off at high temps like the comma and others do

most of em,  commas is a real PITB  it go,s  black, an ends up like thin pish  efter 200 or so miles

 

M