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GL-5 + GL-4 #4614525
12/26/17 11:02 AM
12/26/17 11:02 AM
Joined: Mar 2008
Posts: 607
A Warm place to live in
berniedd Offline OP
berniedd  Offline OP
Joined: Mar 2008
Posts: 607
A Warm place to live in
A friend changed his differential gear oil in his Toyota HiLux. It called for GL-5 but he found himself in a pinch with not enough GL-5 to fill up with. So he put in 0.8 liter of GL-4 he had lying around to make up the difference. This was about 20% of the total gear oil volume he put in. Is he good? He uses the pickup only for mild to moderate load use.

Re: GL-5 + GL-4 [Re: berniedd] #4614531
12/26/17 11:13 AM
12/26/17 11:13 AM
Joined: Dec 2011
Posts: 4,738
North Carolina
rooflessVW Offline
rooflessVW  Offline
Joined: Dec 2011
Posts: 4,738
North Carolina
Good enough? Probably.

Would it be good enough for me? Absolutely not.


"Zed's dead baby, Zed's dead."
Re: GL-5 + GL-4 [Re: berniedd] #4615308
12/27/17 02:33 AM
12/27/17 02:33 AM
Joined: Sep 2015
Posts: 2,259
Malaysia
zeng Offline
zeng  Offline
Joined: Sep 2015
Posts: 2,259
Malaysia
I wouldn't worry if both were 8xW90 or monograde.
I would be worried if they are 75W90.

Re: GL-5 + GL-4 [Re: berniedd] #4615647
12/27/17 12:02 PM
12/27/17 12:02 PM
Joined: Mar 2008
Posts: 607
A Warm place to live in
berniedd Offline OP
berniedd  Offline OP
Joined: Mar 2008
Posts: 607
A Warm place to live in
Not sure about the GL-4 viscosity but the GL-5 was 80W-90 (what the owner's manual spec'ed).

Last edited by berniedd; 12/27/17 12:03 PM.
Re: GL-5 + GL-4 [Re: berniedd] #4616359
12/28/17 07:07 AM
12/28/17 07:07 AM
Joined: Sep 2015
Posts: 2,259
Malaysia
zeng Offline
zeng  Offline
Joined: Sep 2015
Posts: 2,259
Malaysia
With minimum 80% being of GL5 80W90 viscosity grade, I would speculate that should be good for your friend's application.


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