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Using heavier weight oil in airlocked diff

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TheOtherLeft

Joined: Sun Aug 27, 2006 11:30 pm
Posts: 818
Location: Sydney

Posted: Mon Dec 13, 2010 10:47 pm

I'm up for changing my rear diff oil and am wondering what weight oil I should use.

I have an airlocker as well.

The factory manual says 80W90 GL5, I've just phoned ARB and they say:

Normal use: Shell diff oil (SAE90)
Mobilube GX90

Heavy use: Shell Spirax 85W-140 (GL5)
Mobilube GX140 (GL4)

Now, I have Vitara gears (5.12) that are a bit noisy at certain speeds, probably due to age.

Would going a heavier weight diff oil be beneficial to longer life etc? I've run these gears for 3+ years and it sounds the same so is not getting worse. I'm thinking about going the Shell Spirax 85W-140. Do you guys recommend others?

What are the implications of running heavier weight oil? - Increased resistance due to a thicker oil being spun around???

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christover1

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Joined: Tue Jul 15, 2008 11:30 pm
Posts: 8203
Location: Melbourne
Vehicle: Pajero 91 NH 3.0 SWB

Posted: Tue Dec 14, 2010 12:19 am

My personal preference/belief would be standard grade oil if in cooler climates, as heavy oil can give drive resistance until warmed up.
But I would add a diff oil conditioner/additive to help with the noise.

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TheOtherLeft

Joined: Sun Aug 27, 2006 11:30 pm
Posts: 818
Location: Sydney

Posted: Tue Dec 14, 2010 12:36 am

christover1 wrote:

Yes I will be adding the Nulon stuff as well.

The change in the heavier gear oil is only the hot temperature viscosity, from 90 to 140 so I suppose it'll take longer to get warmed up.

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Bruce

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Joined: Sun Jun 11, 2006 11:30 pm
Posts: 4003
Location: Brisbane

Posted: Tue Dec 14, 2010 12:54 am

I have alwyas used 85/140 in my diffs with air lockers. Never had a worry.

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[quote="royce"] I wouldnt mind insulating my rear

11_evl

Joined: Tue Apr 10, 2007 11:30 pm
Posts: 846
Location: logan reserve, Brisb

Posted: Tue Dec 14, 2010 2:18 am

Go the heavier one, any extra weight down low helps sierras

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BUZOOKA

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Joined: Sun Aug 30, 2009 11:30 pm
Posts: 2659
Location: hobart tasmania

Posted: Tue Dec 14, 2010 2:28 am

doesnt really help so much as i have a navara .. but i run lsd oils in both my diffs rear lsd also in my transfer and gear box.. its bit thicker and while cold is a smidge harder to shift .. but i feel it protects my cogs and stuff a bit better so i can live with a stiff shift of a morning

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lump_a_charcoal

az supporter

Joined: Wed Feb 28, 2007 10:30 pm
Posts: 4454
Location: Botany, NSW
Vehicle: MY2019 Jimny

Posted: Tue Dec 14, 2010 6:12 am

11_evl wrote:

Go the heavier one, any extra weight down low helps sierras

TheOtherLeft

Joined: Sun Aug 27, 2006 11:30 pm
Posts: 818
Location: Sydney

Posted: Wed Dec 15, 2010 10:42 pm

Do people still recommend using LSD oil in airlocked diffs? Something about the additives being better for the seals???

The ARB list standard oils.

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atari4x4

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Joined: Mon Dec 11, 2006 10:30 pm
Posts: 34842
Location: East Radelayed
Vehicle: SV420+SV620 Vitara's

Posted: Wed Dec 15, 2010 11:02 pm

i run normal castrol oil in mine as per arb's specs.

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TheOtherLeft

Joined: Sun Aug 27, 2006 11:30 pm
Posts: 818
Location: Sydney

Posted: Thu Dec 16, 2010 12:08 am

atari4x4 wrote:

i run normal castrol oil in mine as per arb's specs.

Does brand matter as ARB only recommend Shell or Mobil? (assuming I'm using the same grade)

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tanshi

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Joined: Tue Jan 09, 2007 10:30 pm
Posts: 7717
Location: Brisbane

Posted: Thu Dec 16, 2010 12:11 am

i doubt brand will really make much difference.

i run standard epx90 in my airlockers

TheOtherLeft

Joined: Sun Aug 27, 2006 11:30 pm
Posts: 818
Location: Sydney

Posted: Thu Dec 16, 2010 1:45 am

Would going fully synthetic be worth it, eg CASTROL SYNTRAX 75W-90?

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Fatzook

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Joined: Sat Oct 27, 2007 11:30 pm
Posts: 14977
Location: The Hills
Vehicle: Vitara, NGV

Posted: Thu Dec 16, 2010 2:06 am

TheOtherLeft wrote:

Would going fully synthetic be worth it, eg CASTROL SYNTRAX 75W-90?

Not IMO. And if you are doing regular diff oil changes, you would just be throwing your money away.

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TheOtherLeft

Joined: Sun Aug 27, 2006 11:30 pm
Posts: 818
Location: Sydney

Posted: Thu Dec 16, 2010 10:58 pm

Thanks all,

I've settled on Castrol EPX 80W90 plus some Nulaon diff additive.

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