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BuckBlu110

Member Since: 19 Apr 2014
Location: in the pub
Posts: 709

1994 Defender 110 BMW M57 3.0 Diesel CSW Buckingham Blue

Oil for Salisbury rear axle

I’m replacing the gasket on my rear axle and am obviously going to need more oil to fill it up again, previously I’ve used ep 80w/90 but I thought I ought to check online and have now found people saying that it must be GL4 grade not GL5 with others saying different, like one is suitable for the gearbox/transfer box and the other not and vise-versa, which has got me confused and concerned. Any ideas what oil is recommended for the rear diff and can the same oil be used in the rest of the transmission?

2nd Aug 2019 5:10pm

MK

Member Since: 28 Aug 2008
Location: Santiago
Posts: 2259

2007 Defender 110 Puma 2.4 SW Chawton White

Lt230 can use GL4 or GL5
Diffs commonly use GL5 (EP90, 80W90, 75W90). Not sure which viscosity for your diff model.
Gearboxes mostly use GL4 or some other manual transmission blends. Straight GL5 is not recommended for synchro transmission. Puma 110" SW

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Earth first. Other planets later

2nd Aug 2019 10:43pm

BuckBlu110

Member Since: 19 Apr 2014
Location: in the pub
Posts: 709

I’ve since been told that GL5 can attack the brass components in the Salisbury diffs, so the more I look into it the more conflicting information I get, definitely confused now

3rd Aug 2019 8:11am

Bluest

Member Since: 23 Apr 2016
Location: Lancashire
Posts: 3997

2007 Defender 110 Puma 2.4 XS CSW Java Black

You can get oils that are both GL4 and GL5 and are fine for all the driveline. They are a bit more expensive but are good if you want to just use one product throughout. Miller's and Motul are two brands that make them.

If you are not sure I thoroughly recommend you contact Opie Oils. They are knowledgeable and helpful. 2007 110 TDCi Station Wagon XS

3rd Aug 2019 10:01am

windy81

Member Since: 14 Mar 2018
Location: North Wales
Posts: 311

BuckBlu110 wrote:
I’ve since been told that GL5 can attack the brass components in the Salisbury diffs, so the more I look into it the more conflicting information I get, definitely confused now

apparently this only ever happens when the oil starts to boil, which is never, but the risk is there albeit very small.
GL5 for the most part is a better oil

3rd Aug 2019 11:25am

dailysleaze

Member Since: 23 May 2013
Location: United Kingdom
Posts: 237

The GL5 talk is a hangover from the Series era. Either is fine.

3rd Aug 2019 3:07pm

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