I just bought 2016 RR Sport Supercharged 5.0 V8 (GA597312) with 57k miles and 90 days of limited warranty from Autonation.
It seems rear differential oil (every 5 yrs needed) was never replaced. Need help with two things:
1. What oil is LL recommended for this application? And how can I verify that by myself? Owner manual has only engine oil info. VIN web search is very unclear about fluids.
2. Is a seller (bmw dealer in my case) responsible for such missed compulsory maintenance? The given warranty doesn't cover cases if the vehicle was not maintained accordingly. So, any dif issues automatically withdraw and it worries me a lot. There are also missed transfer case oil, spark plugs and supercharger belt replacements.

Appreciate any advice on it.

Do you have a open rear diff or a electronic locking one ? as they use a different spec oil in each.

I think you would be very lucky if any dealer would accept responsibility for previous missed service item's on a used vehicle, that would be down to the previous owner not having it done I would think.

Cheers
Col

Should be locking. Not sure

If you have Dynamic mode, then it's a locking diff.

You can find the oil specs in the WSM, link in my signature below

On a personal note: when I buy a 2nd hand vehicle, the first thing I do is change ALL the fluids. This way I know the baseline for any trouble that may arise during my ownership.

IMHO, changing fluids is cheaper than having to repair/replace an engine, gearbox, transfer case, diffs, etc. --
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport Supercharged V8 HSE Dynamic



Defender Puma Workshop Manual: https://bit.ly/2zZ1en9
Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO
Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ

naks,
thanks. I got a lot of information.
I have a dynamic mode. But how can I understand if I have the ETM unit (attached)?
Castrol SAF-XO - 75W/90 vs Castrol BOT 720?

Click image to enlarge

Dynamic mode means that it has the ETM version.

You can also look at the 4x4 information screen - it will show the diffs locking & unlocking. --
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport Supercharged V8 HSE Dynamic



Defender Puma Workshop Manual: https://bit.ly/2zZ1en9
Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO
Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ

Quote:

Dynamic mode means that it has the ETM version.

Quote:

You can also look at the 4x4 information screen - it will show the diffs locking & unlocking.