I also need this info for diffs and t case. I'll start digging. Really wish these specs were in the manual and it didn't just say "contact dealer". This is common maintenance not something top secret.

 

So I think I got the part numbers and I did hit up my dealer for prices. Price came out about $30 over ordering from Atlantic British. I'm probably going to be buying a few other little pieces from the dealer so I'm ok paying a touch extra up front to confirm the actual part numbers for the fluids.

 

I posted the spec above post for all fluids.

Summary:

LUBRICANTS AND FLUIDS Part Variant Specification SAE 5W-30 engine oil meeting Jaguar Land Rover specification STJLR.03.5005 or WSS-M2C934-B. If unavailable, 5W-30 engine oil to ACEA C2 specification may be used. All V6 diesel vehicles and V8 diesel vehicles with a Diesel Particulate Filter (DPF) Engine oil SAE 5W-30 engine oil meeting Jaguar Land Rover specification STJLR.03.5003 or WSS-M2C913-C. If unavailable, 5W-30 engine oil to ACEA A5/B5 may be used. V8 diesel vehicles without a DPF SAE 0W-20 engine oil meeting Jaguar Land Rover specification STJLR.51.5122/WSS-M12R536-A. All petrol vehicles All Land Rover recommends Shell ATF L12108. transmissions Transmission oil V6 diesel, V8 Land Rover recommends TL 7300 Shell TF 0753. diesel, V6 petrol and V8 petrol vehicles Transfer gearbox oil Front differential oil All vehicles Land Rover recommends Castrol SAF-XO. Rear differential oil Non-locking Land Rover recommends Castrol SAF-XO. Electronic Land Rover recommends Castrol BOT 720. locking Rear differential oil Electronic Land Rover recommends Castrol BOT 720B. locking - Hybrid vehicles Land Rover recommends Texaco Cold Climate PAS fluid 33270.

 

Update to this thread

So I did my diff oil changes and T-case at ~34,000 miles (2019 D5 diesel with rear locking diff). I bought all genuine fluids from the dealer. I used the dealer so I would know what fluids to actually use (the actual PNs seem to have been shrouded in secrecy). They confirmed the part numbers with my serial number. Below is what I got:

LRN7591 - Front Diff and open rear diff fluid
IYK500010 - T case fluid
LR019727 - Rear locking diff fluid

The key takeaway here, these are the SAME fluids that go into the LR3 and LR4 vehicles. So moving forward I'll probably be ordering from AB or wherever. I needed a fluid transfer pump for the all three gear cases which was kinda crappy but whatever. In the LR3 you could refill the T-case with a funnel but not this car. Also on the T-case, you have to move a little heat shield to access the fill drain plug. I just removed 2 bolts and loosened the 3rd and moved the shield out of the way. Oh and the stupid T-case, you gotta jam the transfer fluid pump hose kinda sideways in there. Otherwise it spills everywhere. Which is BS but now I know. Oh and the front "skid plate" is a joke. Its so light. The LR3 skid is a decent chunk of metal, this is a cookie sheet.

The recommended fill amount is pretty much the same as "overflow". So fill until it comes out.

At 34k on a diesel D5 that doesn't tow, front diff fluid looked brand new. T-case fluid looked like it had a bit of color in it but still the fluid looked rather clear. Rear diff, LOL yeah it was ready for a change. I think moving forward I'll do the front diff and T-case at the recommended 60k interval. But rear diff is getting fluid changed at 30k (backstory, I've had rear carrier bearings go out in EVERY rover I've ever owned, my fancy new D5 with the fancy rear diff locker AINT gonna get torn up).

I think my friend said that Royal Purple Syncromax is the correct spec for the T-case. Once I'm out of warranty I'll probably swap over.

Overall took me about 2 hours to do all three. I had half a bottle of T-case fluid on the shelf left over from my LR3 so I only bought one bottle from the dealer. So total bill was like $200 out the door from the dealer (rear locker fluid is pricey). Also I'm sure this was faster than my dealer also. Already put 1k on the car since the service. I figure if I had done it wrong, I'd know by now. But nah. All good.

Anywho, all doable. Gonna maintain this car because this is why we have nice things.

 

So I'm about to do my 64k service and the T-case is included (but not the diffs for some reason).

Anyway, as this is my first time doing it myself, I too went the dealer route to buy the fluids. Yeah, the oil was a bit pricey at $18/qt, but holy crap was the gear oil for the T-case expensive at $30/qt and you need 2 quarts.

What do you use in the diffs? Wouldn't it be the same as in the T-case?

 

Nah diff and T case oils are different. Unfortunately this isn't like my 73 109 that 2 gallons of GL-4 is used in everything except the engine.

If the prices are a concern for you, look at Atlantic British. Usually they have name brand alternatives (like Castrol) and a bit better pricing.

 

Yeah, I'm used to my Series 3 where 90W gear oil goes everywhere but the crankcase.

Prices aren't that much of a concern, was just surprised. Appreciate the info!