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GL4 vs GL5 for 4wd transfer case

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Matt Matt Profile Pic

Posts: 2

Joined: December 10, 2021
Matt Profile Pic
Matt

Posts: 2

Joined: December 10, 2021

Posted: 4 years ago | Posted in GL4 vs GL5 for 4wd transf...

I have a 2004 turbo diesel hilux. I am about to try the penrite GL4 75w90 full synthetic gear oil in the manual transmission. I have traditionally used Caltex Easyshift 75w90 in both gearbox and transfer case. I am wondering if it is safe to run a GL4 oil in the transfer case or is a GL5 oil better for the transfer case?

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jrodger jrodger Profile Pic

Penrite Staff

Posts: 585

Joined: October 18, 2018
jrodger Profile Pic
jrodger Penrite Staff

Posts: 585

Joined: October 18, 2018

Posted: 4 years ago | Posted in GL4 vs GL5 for 4wd transf...

Hi Matt,

 

Thanks for your inquiry, TOYOTA specify either GL4 or GL5 75W-90 for both the Gearbox and Transfer case.

GL5 Gear Oils create Shift quality problems in Manual Transmissions due to the amount of "EXTREME PRESSURE" additive. GL4 performance is superior in Manual Transmissions, it does not effect shift quality associated with EP like GL5.

You can consider either GL4 or GL5 in your Transfer Case, no shift quality issues as they do not have Synchro's.

Regards

Jamie

 

 

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Matt Matt Profile Pic

Posts: 2

Joined: December 10, 2021
Matt Profile Pic
Matt

Posts: 2

Joined: December 10, 2021

Posted: 4 years ago | Posted in GL4 vs GL5 for 4wd transf...

Cheers Jamie,

have always heard that GL5 oils weren’t friendly on synchro rings.

Would you say a GL 5 always a better option in a conventional 4x4 transfer case as opposed to a GL4 (which I have been using for a few years)?
I also have a 2006 Hdj100r Landcruiser with a centre diff/transfer case setup. I have purchased some penrite trans gear for the centre diff/transfer on that. 

also, does penrite manufacture oils which are sold under the Repco house brand? Ie - are oils in “Repco” branded bottles actually manufactured by penrite?

cheers,

matt

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jrodger jrodger Profile Pic

Penrite Staff

Posts: 585

Joined: October 18, 2018
jrodger Profile Pic
jrodger Penrite Staff

Posts: 585

Joined: October 18, 2018

Posted: 4 years ago | Posted in GL4 vs GL5 for 4wd transf...

Hi Matt,

As previously stated You can consider either GL4 or GL5 in your Transfer Case, no shift quality issues as they do not have Synchro's. If you have been using GL4 with no issues we recommend sticking with it. Also means only 1 product for both Transfer Case and Gearbox.

Regards

Jamie

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