EP90 GL5 = Feck

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I found the bit below on Difflock; interesting in that it infers that the leaching takes place normaly only that with GL5 the process is accelerated somewhat:

If you own an older generation vehicle such as a Series Land Rover you must be VERY careful about selecting your transmission oil. This is because certain Extreme Pressure additives containing Molybdenum compounds can give rise to copper leaching and so these will attack the soft metals, such as brass, found in Series Transmissions.

As far as metallic leaching is concerned, whether an oil is GL-4 or GL-5 is only relevant in that GL5 typically contains twice the concentration of additives as GL4. Hence IF a GL5 oil contains the problem Molybdenum compounds then the leaching action will be faster. However both GL-4 and GL-5 oils can be formulated without the problem compounds so the GL rating is not strictly relevant. Note though that the mineral or synthetic base stocks (the oil itself) of a lubricant will not attack soft metals so it does not follow that Synthetic Gear Oils are bad for older transmissions.

Only the lubricant manufacturer (and hopefully your supplier so ask them!) will know whether the problem Extreme Pressure Additive compounds are used and if these are in sufficient concentration to be problematic in certain transmissions.

Difflock.com Discussion Forum: Auto Gearbox Oil
 
Haynes fer 90/110/Deependers, 83' to 95' says: Hypoid gear oil, viscosity SAE 80 or SAE 90 to API GL4, MIL-L-2105, or better (see stupidly I would've just thought GL5 was just better than GL4!)

Service manual for SIII's just says SAE EP90 or the like fer different manufacturers. For overseas or extreme conditions it lists API GL4 or MIL-L-2105.

Ain't V clear is it unless yer a fekin siontist, should be when the bastard stuff eats yer bushes quicker than K D Lang after a dry spell.
 
'ang about juss a minit!

The API GL5 is the lubrication specification not the list of ingredients - it's a bit more complicated than just 'GL5 will eat yer bush' (es)

There are GL5 spec hypoid gear oils which won't eat phosfor bronze (or other copper containing compounds) but then there are ones which will... It seems there are no (mainstream manufacturers) GL4 spec oils which will affect phosphor bronze.

I've been doing a bit 'o research - eggsample:

motorcar lubricant & synthetic engine oil, range lubricants igol Search this page for Synthegear and you'll see it says:

"100% synthetic lubricant for gearboxes and axles (without no slip-differential).
Total Drive Concept : API GL4 and API GL5 without synchros corrosion risk"

Where you find the stuff in the UK I dunno.

To meet API GL5 there is no test for how corrosive towards copper and copper bearing alloys the oil is. To meet API MT1, there is a test for sensitivity towards copper.

Hence, use API MT1 with impunity it's fine with copper bearing compounds.

Check with the manufacturer of API GL5 rated oils to find out from them how agressive their oil is towards copper bearing compounds before using it - or - if you can't be arsed to do that, use a GL4 oil instead.

Useful link here: Comma Where to Buy Page

Find your nearest Comma oil stockist by postcode - they do both GL4 and 5

Marcus, this is the stuff we bought from Kieth Gott, they're based in Gravesend just up the road from me, I'll be ringing them in the morning to find out how much damage we might be doing using their GL5 - I'll give you a shout when I know.
 
I recently had me 200TDi's oils changed at a non-LR garage.
I had to tell them to use ATF in the main and EP90 in the transfer cos they dint know better. Therefore, it's very unlikely that they would have known about this problem and may have used GL5.
Should I be worried?
 
We'll know tomorrow how bad the comma stuff is - I got a quote from a Land Rover dealer earlier for 25litres of EP90 for a little over £60 which int too bad considering it's from a Landy stealer...

If the comma/planet stuff doesn't check out nicely then I'll have a check of the brand on the stuff from the stealers and do the same check with the manufacturer o' that - shipping it might be a problem but you could always try yer local stealers (much as I hate to say it)

Cheers,
 
ave sed it before on this fred.. get yer arses down to the place where yer local farmers get their oil. as a lot of tractors and farm stuff need gl4 oil.
 
well wear a flatcap, stick a bit of staw in yer gob, get some **** on yer boots and tell im yer a fermer on ollidaze and you need some 'gurbox ill'
 
Eh up Wesser where you bin?

I s'pose in later boxes it's a matter of what the synchro rings are made of especially if they are replacements. I can't think of any other fozzy bronze bits in them.
 
Griffdowg said:
i got mine from a farmers joint and i could only find GL5... so your wrong slob! ;)
Click to expand...
well i tried all the usuall suspects around here and came up empty handed, so i tried the super markets and got nowt. ah was in the farmers suppliers getting more gas fer me welder when i noticed a **** load of it. so whenever i was in a place that supplied farmers i had a look. and they all had it.
maybe yer agricultural places dint know about the problems and just get in gl5. maybe they have that gl5 mt1 or whatever it is, maybe yer local farmers all have machinary that dint need gl4.
but i know i can go into anyone of the many agricultural joints around here and get a shed load of it.
 
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