Just a confirmation on this please

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towsey956

towsey956

Well-Known Member
Posts
1,104
Location
Northyorkshire
hi all

I’ve searched and found alsorts but just wondering wot people’s experiences and views are

I have a 98my d1 and I’m going to change the diff oils and put 80/90 in but...can I use gl-5 or does it have to be gl-4, it’s just that I’ve found things saying that gl-5 corrodes certain parts

Many thanks in advance

Towsey
 
Thanks

Except no one in my town has it “oh no mate gl-5 superseded it sorry” is all I seem to get

Is there definetly an issue using gl-5 because I know my mate has it in stock and I’m meant to be using his ramp tomorrow

Cheers

Towsey
 
To be honest I’m not doing t box just diffs, I don’t know if they have bronze in or not. Yeah sounds like gl4 the stuff just typical I get first chance in ages to use ramp and have wrong stuff
 
GL-4 was not superseded by GL-5 they're different ratings, most of the EP80w-90 around nowadays is GL-5 rather than the old monoweight GL-4 EP90, and is fine in your transfer case and diffs.

What does get complicated is most transaxle oil is marked both GL-4 and GL-5, meaning it is a 5 with friction modifiers and various additives to buffer the sulfur against damaging yellow metals (i.e phosphor bronze) - making it okay in a gearbox / transaxle - whereas purely GL-5 is not.

Short version - manual says it's good.

In the manual.jpg
 
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