GL-5 + GL-4

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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.
 
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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