Thread: Locking rear diff - which oil!

I have the E-DIFF, and as far as I can tell the oil above is what goes into the TC and DIFFS.

Pro Gear GL-5 75W-85 is a premium full synthetic, API GL-5, SAE 75W-85, differential and transaxle gear oil manufactured with a blend of carefully selected synthetic base oils and purpose designed additives including an enhanced wear protection package to provide excellent load carrying ability and longer service life.
Viscosity

• 75W-85

Base Oil

• Full Synthetic

Used in the following applications:

• Differentials
• Transaxles
• Transfer Cases

Can be used where the following SAE viscosities are recommended:

• SAE 80
• SAE 75W-90

Application

Pro Gear GL-5 75W-85 is optimised for differentials, both hypoid and limited slip, transfer cases, manual transaxles and gearboxes in late model passenger cars, 4WD's and light commercial vehicles that specifically require the use of an API GL-5, SAE 75W-85 viscosity gear oil.
Pro Gear GL-5 75W-85 is suitable for use where MB 235.7 and ZF TE-ML 18 is specified as well as where VW TL 521 45-X (G 052 145 A1), VW TL 521 90 (G 052 190 A2/G 055 190 A2) is recommended. Pro Gear GL-5 75W-85 may be used in selected manual transmissions that require a SAE 75W-85 viscosity grade with API GL-5 specifications It can be used to improve shift quality in colder climates where either SAE 75W-90 or SAE 80 API GL-5 oils are specified.
Pro Gear GL-5 75W-85 85 is already dosed with the correct amount of friction additive for use in limited slip differentials, no extra additive is required.

Originally Posted by Redback

I have the E-DIFF, and as far as I can tell the oil above is what goes into the TC and DIFFS.

Pro Gear GL-5 75W-85 is a premium full synthetic, API GL-5, SAE 75W-85, differential and transaxle gear oil manufactured with a blend of carefully selected synthetic base oils and purpose designed additives including an enhanced wear protection package to provide excellent load carrying ability and longer service life.
Viscosity

• 75W-85

Base Oil

• Full Synthetic

Used in the following applications:

• Differentials
• Transaxles
• Transfer Cases

Can be used where the following SAE viscosities are recommended:

• SAE 80
• SAE 75W-90

Application

Pro Gear GL-5 75W-85 is optimised for differentials, both hypoid and limited slip, transfer cases, manual transaxles and gearboxes in late model passenger cars, 4WD's and light commercial vehicles that specifically require the use of an API GL-5, SAE 75W-85 viscosity gear oil.
Pro Gear GL-5 75W-85 is suitable for use where MB 235.7 and ZF TE-ML 18 is specified as well as where VW TL 521 45-X (G 052 145 A1), VW TL 521 90 (G 052 190 A2/G 055 190 A2) is recommended. Pro Gear GL-5 75W-85 may be used in selected manual transmissions that require a SAE 75W-85 viscosity grade with API GL-5 specifications It can be used to improve shift quality in colder climates where either SAE 75W-90 or SAE 80 API GL-5 oils are specified.
Pro Gear GL-5 75W-85 85 is already dosed with the correct amount of friction additive for use in limited slip differentials, no extra additive is required.

This is what I currently have in both diffs.

The LR specified oil for the e-diff is Castrol BOT720. It's available in 1L bottles and can be purchased either directly from a LR dealer or from LR specialist suppliers such as Karcraft.

I use pentrite pro gear 75W-90 in my diffs. You should be fine to use any good quality GL-5 spec gear oil in the normal diffs, the e-diff not sure if a oil with friction modifiers for LSD would be suitable?

Originally Posted by shanegtr

I use pentrite pro gear 75W-90 in my diffs. You should be fine to use any good quality GL-5 spec gear oil in the normal diffs, the e-diff not sure if a oil with friction modifiers for LSD would be suitable?

Penrite Pro Gear GL-5 states it is suitable for LSD applications as well. The GL-4+ Pro Gear is not suitable apparently.

Originally Posted by Discofever

Penrite Pro Gear GL-5 states it is suitable for LSD applications as well. The GL-4+ Pro Gear is not suitable apparently.

You dont want to use a GL-4 in any diff, wont cope very well with the sliding that hypoid gears in diffs do, its more of a straight up gear oil more suitable for manual transmissions, traditional transfer cases etc....

I've had a bit of a google search (about 10 mins worth) and castrol syntrax limited slip 75W-140 may be suitable for the e-diff.

Your looking at thousands of damage if you stuff things up on the basis of some unknown recommending a dodgy oil.

Buy the correct oil - the front diff oil can be sourced in auto shops, the correct transfer case oil is only available from dealers and is a bit expensive but you dont use much. Buy the e-diff oil from the dealer to ensure you get the right stuff.

Despite what Reback says the e diff oil is different to the standard diff oil.

The standard diff is 1.1l of Castrol SAF-XO - 75W/90
The E-Diff is 1.5l of Castrol SAF Carbon Mod Plus

Garry

Originally Posted by garrycol

Your looking at thousands of damage if you stuff things up on the basis of some unknown recommending a dodgy oil.

Buy the correct oil - the front diff oil can be sourced in auto shops, the correct transfer case oil is only available from dealers and is a bit expensive but you dont use much.

Only something like 0.6 litres in diff so not worth getting caught up trying to save $20. Only need to change every 50k or so.