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Home > Maintenance & Modifications > Diff/Transfer case oil - EP80/90 GL4 or GL5
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5745
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Diff/Transfer case oil - EP80/90 GL4 or GL5
Having a front ATB and a centre ATB Ashcrofts/Winchester Gears suggest EP80/90 Mineral oil.
But, GL4 or GL5 ? 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #1019700 31st Dec 2023 12:56pm
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MK



Member Since: 28 Aug 2008
Location: Santiago
Posts: 2267
Chile 2007 Defender 110 Puma 2.4 SW Chawton White
Defenetly GL-5.

I use mineral oil for the front ATB and synthetic for the transfer case (with ATB) as it does not degrade that fast due to high temperatures (at least where I use it). Puma 110" SW

.............................................................
Earth first. Other planets later
Post #1019705 31st Dec 2023 2:13pm
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johnlad



Member Since: 18 Dec 2023
Location: Blackpool
Posts: 35
United Kingdom 
Gl5 not recommend for any parts that contain yellow metals (brass).
Iā€™d check with the manufacturer what they recommend.
Post #1019710 31st Dec 2023 3:24pm
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MK



Member Since: 28 Aug 2008
Location: Santiago
Posts: 2267
Chile 2007 Defender 110 Puma 2.4 SW Chawton White
On a Std LT230 with "yellow" thrust washers I use GL-4. Puma 110" SW

.............................................................
Earth first. Other planets later
Post #1019711 31st Dec 2023 3:34pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5745
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Copied from another thread/topic



Gearbox:
R380: MTF94 or TRIPPLE QX ATF Dexron III
LT77: ATF Dexron II/III
MT82: 75W/90 fully synthetic MTF
LT85 (Santana): 20/50 engine oil
ZF autobox: ATF Dexron II/III
Jatco autobox: Texaco 402 oil or Dexron II if not available

Transfer Box:
LT230:
-- Pre Td5: EP80/90
-- Td5 on: 75W/90
LT230 with ATB: EP 80/90 mineral oil, not synthetic
Borg Warner: ATF Dexron II/III

Differential:
Standard: EP80/90
With ATB: EP80/90 mineral oil, not synthetic 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #1019712 31st Dec 2023 3:40pm
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MK



Member Since: 28 Aug 2008
Location: Santiago
Posts: 2267
Chile 2007 Defender 110 Puma 2.4 SW Chawton White
Differential bias effect on the central (ATB) diff on the transfer case is negligible, so synthetic GL5 is good for me. Puma 110" SW

.............................................................
Earth first. Other planets later
Post #1019713 31st Dec 2023 3:51pm
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bankz5152



Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2082
2004 Defender 110 Td5 DCPU Epsom Green
excossack wrote:
Copied from another thread/topic



Gearbox:
R380: MTF94 or TRIPPLE QX ATF Dexron III
LT77: ATF Dexron II/III
MT82: 75W/90 fully synthetic MTF
LT85 (Santana): 20/50 engine oil
ZF autobox: ATF Dexron II/III
Jatco autobox: Texaco 402 oil or Dexron II if not available

Transfer Box:
LT230:
-- Pre Td5: EP80/90
-- Td5 on: 75W/90
LT230 with ATB: EP 80/90 mineral oil, not synthetic
Borg Warner: ATF Dexron II/III

Differential:
Standard: EP80/90
With ATB: EP80/90 mineral oil, not synthetic


Funny how they say pre and post td5 even tho they at both lt230s...

Ive always used GL4 EP90 Mineral in diffs and Lt230. Probably the last 50k miles or more. As suggested by Nige at Xcess4x4.

Or if you have expensive diffs then use swepco. Cant comment on diffs but it does make the R380 smoother. Instagram @defender_ventures
Empire Tuning - Agent
Post #1019716 31st Dec 2023 5:17pm
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MK



Member Since: 28 Aug 2008
Location: Santiago
Posts: 2267
Chile 2007 Defender 110 Puma 2.4 SW Chawton White
I would not use GL4 in a (hypoid) diff. Puma 110" SW

.............................................................
Earth first. Other planets later
Post #1019721 31st Dec 2023 6:17pm
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 3214
Malta 2012 Defender 90 Puma 2.2 CSW Santorini Black
I believe that the Rover differential is a spiral bevel gear.
Not so familiar with Salisbury, but by the external look of the pinion flange, that looks hypoid. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black
Post #1019732 31st Dec 2023 7:49pm
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MK



Member Since: 28 Aug 2008
Location: Santiago
Posts: 2267
Chile 2007 Defender 110 Puma 2.4 SW Chawton White
There is a bit of an offset from the center. AFAIK

Anyway, synthetic gear oil lasts longer on the lt230 subjected to high temperatures. Puma 110" SW

.............................................................
Earth first. Other planets later
Post #1019776 1st Jan 2024 2:05pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5745
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
bankz5152 wrote:
excossack wrote:
Copied from another thread/topic



Gearbox:
R380: MTF94 or TRIPPLE QX ATF Dexron III
LT77: ATF Dexron II/III
MT82: 75W/90 fully synthetic MTF
LT85 (Santana): 20/50 engine oil
ZF autobox: ATF Dexron II/III
Jatco autobox: Texaco 402 oil or Dexron II if not available

Transfer Box:
LT230:
-- Pre Td5: EP80/90
-- Td5 on: 75W/90
LT230 with ATB: EP 80/90 mineral oil, not synthetic
Borg Warner: ATF Dexron II/III

Differential:
Standard: EP80/90
With ATB: EP80/90 mineral oil, not synthetic


Funny how they say pre and post td5 even tho they at both lt230s...

Ive always used GL4 EP90 Mineral in diffs and Lt230. Probably the last 50k miles or more. As suggested by Nige at Xcess4x4.

Or if you have expensive diffs then use swepco. Cant comment on diffs but it does make the R380 smoother.


Just an ATB up front and ATB in the transfer case. Wincheser also suggested SwepCo.
A decent EP80/90 mineral as suggested by Winchester/Ashcrofts should do the job. 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #1019782 1st Jan 2024 3:41pm
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Likeomg



Member Since: 29 Jun 2012
Location: Lake District / Newcastle
Posts: 2627
2010 Defender 90 Puma 2.4 HT Stornoway Grey
Went with Swepco, made a bigger difference than i would of thought

ATB in diffs from winchester

MT82
Swep-Co 202
Approx 2.2Ltrs Needed
2.5Ltrs Sold

Swep-Co 201
LT230 - 2.3Ltrs Approx
Front Differential - 1.7 Ltrs Approx
Rear Differential - 1.7 Ltrs Approx
5.7Ltrs Needed
6Ltrs Sold
Post #1019812 2nd Jan 2024 1:36am
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Mo Murphy



Member Since: 01 Jun 2008
Location: Letchworth Garden City, Herts
Posts: 2088
United Kingdom 1984 Defender 90 200 Tdi HT Pennine Grey
Likeomg, what difference did it make, for it to be so noticable ?
Mo The Land Rover 90 - Many are called, few are chosen.
Post #1019815 2nd Jan 2024 6:11am
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19627
United Kingdom 
johnlad wrote:
Gl5 not recommend for any parts that contain yellow metals (brass).
Iā€™d check with the manufacturer what they recommend.

Agree,
GL4 in transfer box, GL5 in diffs. Diesel$ Live$ Matter. ā›½ļøšŸ›¢ļøšŸ‘Øā€šŸ”§šŸ§°āš™ļø RED, WHITE & BOOST! šŸ‡¬šŸ‡§
Post #1019879 2nd Jan 2024 6:41pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5745
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
According to Swepco, Swepco201 does have a GL-5 Specification. 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #1020061 4th Jan 2024 9:20am
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