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#4614525 - 12/26/17 10:02 AM GL-5 + GL-4
berniedd Offline


Registered: 03/24/08
Posts: 591
Loc: 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.

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#4614531 - 12/26/17 10:13 AM Re: GL-5 + GL-4 [Re: berniedd]
rooflessVW Online   content


Registered: 12/24/11
Posts: 4061
Loc: North Carolina
Good enough? Probably.

Would it be good enough for me? Absolutely not.
_________________________
"Zed's dead baby, Zed's dead."

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#4615308 - 12/27/17 01:33 AM Re: GL-5 + GL-4 [Re: berniedd]
zeng Offline


Registered: 09/01/15
Posts: 2189
Loc: Malaysia
I wouldn't worry if both were 8xW90 or monograde.
I would be worried if they are 75W90.

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#4615647 - 12/27/17 11:02 AM Re: GL-5 + GL-4 [Re: berniedd]
berniedd Offline


Registered: 03/24/08
Posts: 591
Loc: 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).


Edited by berniedd (12/27/17 11:03 AM)

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#4616359 - 12/28/17 06:07 AM Re: GL-5 + GL-4 [Re: berniedd]
zeng Offline


Registered: 09/01/15
Posts: 2189
Loc: 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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