Unusual noise (groans only way I can describe it) searched forum, as one would say, first time I heard that. Some background 2016 s that had differential replaced at 43,000 on 7/21 under warranty. Noise appeared recently. Replaced differential oil

with redline LS 75/90 at 56,000 on 3/24 due to groan noise when driving forward and reverse at slow speed, still there added LS dif additive still there at 59,000. I’m thinking replace oil redline 75/90 again send out oil for black stone analysis. If there was some sort of binding I should feel some jerky decrease in movement. Photo of black stone analysis. Anyone have a similar thanks in advance for your comments. Cheers Frank

 

Did it make the noise with the OEM BOT 720?

 

"Groaning Noises"
I thought you were referring to a JLR dealer bill!!

 

The replacement differential came with whatever oil JLR put in, no indication of oil description. So short answer don’t know. I’ll have the oil analyzed next time i replace the differential oil and post results. Trying to duplicate noise so my mechanic came hear it and give his assessment. Its always going slow moving forward, backwards or turning and one other thing the noise is intermittent, similar to a dragging brake pad on rotor. Cheers Frank

 

So nothing like a line or hose or part of the inner wheel well?

 

I've resisted as long as I can and I apologize in advance...but, I thought most guys liked it when something groaned.

 

@frank barone
Your V6 S with LSD rear diff could be suffering from premature clutch plate failure.
I have documented this phenomena in my YT series under "Onca Engineering"

You can test your rear diff by driving slowly in a tight figure of 8 pattern (in a vacant parking lot).
Does it make noises or vibration in either turning direction?
You can also attempt a "burn out" on a gravel/sandy road, to see if both tires slip, or if just one slips.
The LSD with OEM clutch plates fail due to delamination of the carbon fiber friction plates from the stainless steel backing plates.
The LSD will hopefully revert back to an Open diff.. or worse, start to chatter and seize.
I have solutions to get your car back to top form.

f-type-x152-72/v6-base-lsd-swap

 

I had a great comeback for you, but [and unfortunately], men are no longer allowed to engage with such subject-matter.

 

You have my permission. I will not report you to the authorities or file a discrimination complaint.

 

Moaning is preferred, not groaning. Just saying............

 

thank you for this suggestion I will definitely try this and report the results. Cheers Frank

 

Well, perhaps the juice just isn't worth the squeeze anymore.

 

That could be interpreted as hitting below the belt I would think.

 

For groaning complaints, I ask if there’s a mother-in-law in the back seat. But no back seat.

 

I took my 2917 S in for fluid changes. Only 15,000 miles, but 7 years. My mechanic, trusted and well respected guy with many high end car customers, put Liquid Moly in the diff along with a bottle of Redline limited slip diff additive. Good quality stuff. When I got the car back I thought I started hearing some groaning from the rear during tight, low speed turns. Got worse over 300 miles until I was sure I was hearing it. Took the car back, he replaced it with the Jag OEM BOT 720. He told me that he found some separation in the OEM fluid, a layer of something heavier separated out at the bottom of the bottle. Something he had not seen with other fluids. He shook it up well and put it in the diff.

Just drove the car and the groaning is totally gone, silent and feels perfect doing slow figure eights and then on the freeway home. Problem, solved. Our theory is that the heavier stuff at the bottom of the bottle is the Jag secret sauce.

 

While I'm a fan of Liqui-Moly fluids (I use their Special Tec LR motor oil which is specifically formulated for Land Rover / Jaguar vehicles), they don't make a fluid that's compatible with Castrol BOT 720. He should have just gone with Motul 300 LS 75/W90 or Ravenol LS GL-5 instead of guessing how much Red Line friction modifier to add to the standard Liqui-Moly 75/W90 fluid and potentially putting your diff at risk. It sounds like he may have gotten the ratio wrong. I've done two diff changes now using Motul 300 LS with zero issues.