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The Hummer Knowledge Base
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I need to change the oil in my diffs. how much and what kind should I use? You need to use 80W-90 Gear Oil, I would recomend getting the gallon size that way you can get a hand-pump that screws onto the top of the bottle. You need to fill it until fluid starts coming out of the fill hole. -Clark
The best stuff is made by Cognis for AM GENERAL, 20 bucks a Litre.
1/2 qt per hub, 80W-90 gear oil Many people use synthetic, like Mobil 1.
Dave B.
2 qt per differential, 80W-90 gear oil AZJULIAN
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