D3/4 rear e-diff locking rear differential oil options

[twr7cx]

Disco 3 lists TYK500070 Castrol Carbon 75W-90
Disco 4 lists LR019727 Castrol Carbon 75-90 (TYK500070 now superseded by LR019727)

Approx 1.2litres required.

Castrol Differential SAF Carbon Mod Pus doesn't look to be a commonly available product other than through the LR part number. Unsure if anything else in the Castrol range is equivalent product. There's some chatter about Castrol BOT 720 being equivalent/appropriate, especially in South African groups where the e-diffs look to be more commonly fitted.

https://www.britpart.com/contentfiles/images/uploads/parts/lr019727lr.jpg
lr019727lr.jpg (https://www.britpart.com/contentfiles/images/uploads/parts/lr019727lr.jpg)

Ravenol MDL Semisyth Multi-Disc locking differentials < RAVENOL MDL Multi-disc locking differentials - Ravenol (http://ravenol.com.au/product.php?code=1222103) > looks to list as an equivalent product. The product description for it states that it's equivalent to the LR part.
Vendor options: Where to Buy (http://ravenol.com.au/where-to-buy.php)

Penrite tech advise that there Pro Gear GL-5 75W-85 is appropriate for use in this application < Land Rover Discovery locking diff oil | Penrite Oil Forum | Penrite Oil (https://penriteoil.com.au/forums/topic/12/Manual%20Transmission%20Diff%20Gear%20Oils/thread/762/Land%20Rover%20Discovery%20locking%20diff%20oil?pa ge=1) >

[Graeme]

I've been using Ravenol MDL for the last few changes.

[Tombie]

I’ve had no issues with Penrite.

[twr7cx]

I’ve had no issues with Penrite.

Thanks. You've been using the Penrite Pro Gear GL-5 75W-85 in one of the factory electronic locking differentials without issue for a while then?

[Discodicky]

Thanks. You've been using the Penrite Pro Gear GL-5 75W-85 in one of the factory electronic locking differentials without issue for a while then?

I am using Penrite Pro Gear Full synthetic 75W-85 in my rear diff and Penrite Pro Gear Full synthetic 75W-90 in front diff.

As per Penrite recommendation for the factory electronic rear diff.

Have been for past approx 100,000 klms and changed approx every 40,000 klms.

Yes I realise it is short change periods but there's not much oil in there.......

[Tombie]

Thanks. You've been using the Penrite Pro Gear GL-5 75W-85 in one of the factory electronic locking differentials without issue for a while then?

Yep, about 100,000km worth of driving.