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Home > Technical > Upgrading the Gear Oil for the Rear Differential
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jules



Member Since: 13 Dec 2007
Location: The Wilds of Warwickshire
Posts: 4999
United Kingdom 2014 Freelander 2 SD4 SE Auto Firenze Red

Andy131 wrote:
What I don't understand is why some drivers diffs are failing - multiple times in some cases, and some drivers diffs are damn near bullet proof. Transmission software?


I think the problem is that the case hardening on the gears and bearings is damaged during manufacture or transport. Impact damage (brinelling) leads to destructive pitting of the case hardening. Dropping from even a moderate height can cause extreme contact loading on the bearings.

https://en.wikipedia.org/wiki/Brinelling

"Brinelling is a material surface failure caused by Hertz contact stress that exceeds the material limit. It usually occurs in situations where a significant load force is distributed over a relatively small surface area. Brinelling typically results from a heavy or repeated impact load, either while stopped or during rotation, though it can also be caused by just one application of a force greater than the material limit.

Brinelling can be caused by a heavy load resting on a stationary bearing for an extended length of time. The result is a permanent dent or "brinell mark". The brinell marks will often appear in evenly spaced patterns along the bearing races, resembling the primary elements of the bearing, such as rows of indented lines for needle or roller bearings or rounded indentations in ball bearings."

So you may be lucky and gear a diff that has been carefully made/transported or not. Jules
Post #362891 2nd Jan 2019 10:05 am
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merlinj79



Member Since: 13 Aug 2019
Location: San Diego
Posts: 315
United States 2008 LR2 i6 S Auto Tambora Flame

Drilled out the case boss for a drain hole today. Details here:

https://www.freel2.com/forum/topic32683-15.html

I switched to AMSOIL Severe Gear synthetic oil, not really comfortable with OEM dino juice given the problems with that diff. Will change every 40K. Since I'm in SOCAL and drive it in the desert, wanted to stick with 80W otherwise would have tried Delvac.
Post #378092 10th Sep 2019 2:11 am
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MotionInc



Member Since: 17 Jun 2019
Location: North America
Posts: 1354
Canada 2008 LR2 i6 SE Auto Tambora Flame

Used Amsoil Severe Gear 75W110 in both diffs. So far so good.
Post #378123 10th Sep 2019 12:28 pm
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Arctic



Member Since: 24 Aug 2016
Location: Westmidlands
Posts: 557
United Kingdom 2014 Freelander 2 SD4 HSE Auto Orkney Grey

I am today going to change both the PTU oil and the rear diff oil, manual gearbox oil done about tow weeks ago, Haldex filter oil to do later in the week hopefully.


I also intend to purchase this magnetic bolt, i will find out today if the PTU and rear diff filler plugs are the same.

https://www.ebay.co.uk/itm/Gold-Plug-Magne...3544668399

I was also wonder if this drain bolt plug would do the job?
https://www.ebay.co.uk/itm/M18-x-1-5mm-Mag...2818964369

I am intending to use this oil below in both the PTU and rear diff.
https://www.ebay.co.uk/itm/5L-Fully-Synthe...SwNotdpB9N
Post #399345 4th Nov 2020 10:14 am
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p_gill



Member Since: 06 Dec 2011
Location: USA
Posts: 1236
United States 2008 Freelander 2 i6 SE Auto Tambora Flame

Artic,

M18 x 1.5 is the correct size

Both of those should be fine.

And the rear differential and PTU use the same Fill plug.

The Gear Oil looks good also.

Thanks

Paul
Post #399460 7th Nov 2020 12:55 am
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sebastian_n7



Member Since: 22 May 2017
Location: London
Posts: 29
United Kingdom 2008 Freelander 2 TD4 HSE Auto Sumatra Black

Sorry to revive old thread, I have used Amsoil Severe 70w-140 in rear and front diffs…@MotionInc I know you have used 70w-110. Just bought in a hurry before a 1,000 mile return trip and only realised grades too late. Not seen any mpg downsides while on the journey, did 500 mile on 3/4 of a tank. Bug then again i also changed tyres to Pilot Sport 4 SUV… car seemed quieter.

As for opinions on whether this will shorten life/hasten diff failure on 130k mile car, please weigh in.

Easy to change back to correct manufacture oil spec.
Post #424650 26th Aug 2022 1:44 pm
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MotionInc



Member Since: 17 Jun 2019
Location: North America
Posts: 1354
Canada 2008 LR2 i6 SE Auto Tambora Flame

I don't think that you will harm the gears at all with that weight. BTW, since my diff has the original sized bearing, I also use Liqui Moly anti friction gear additive as over kill because that's just me! The service bulletins recommend removing "x" amount of gear oil to below the fill levels. That simply makes zero sense to me so I don't. I'd also recommend Dimple magnetic fill plugs as a small but very important investment. I thank @p_gill for that nugget!
Post #424652 26th Aug 2022 2:57 pm
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merlinj79



Member Since: 13 Aug 2019
Location: San Diego
Posts: 315
United States 2008 LR2 i6 S Auto Tambora Flame

I'd guess the level is based on one of these...

- Preventing overflow through a vent hole. No big deal.

- Fuel economy, again no big deal.

- Oil flow within the box. This might be a big deal if the oil flow pattern is designed to reach the bearings in a specific manner. Too much might impede the proper flow?


https://youtu.be/51BQkUafOe8?t=517


Just a thought.
Post #424697 27th Aug 2022 7:06 pm
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sebastian_n7



Member Since: 22 May 2017
Location: London
Posts: 29
United Kingdom 2008 Freelander 2 TD4 HSE Auto Sumatra Black

I have watched the video, very informative. I agree, even Amsol points on its website re fully synthetic gear oils vs mineral “wax-free construction also improves cold-flow properties” but obviously it may not be up to spec. Will revert to correct specs as we get near winter. Thanks all.
Post #424828 31st Aug 2022 11:58 am
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Arctic



Member Since: 24 Aug 2016
Location: Westmidlands
Posts: 557
United Kingdom 2014 Freelander 2 SD4 HSE Auto Orkney Grey

Changing oil on the PTU and rear diff today so hopefully i can add the drain hole on MY07 will report back later.
Post #440840 13th Apr 2024 9:01 am
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AT1963



Member Since: 23 Nov 2021
Location: Leicester
Posts: 252
United Kingdom 2013 Freelander 2 SD4 HSE Auto Orkney Grey

Changed rear diff oil at the weekend.
Easy enough to do but didn't expect oil to come out light brown Shocked
Used castrol EPX 80w90 to replace old oil.
Only got 600ml out and put in 600ml when it started to overflow.
Anyway now done.
Post #440892 15th Apr 2024 5:47 pm
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