Gear Oil Capacity 99 ML320 ?
 

I changed the front and rear differential this week in my ML320.
The only info I could find is 1.6 qts.

The rear took about that much, the front 1.3 quarts. I used Valvoline 80-90 durablend.

So I moved the truck to make double sure it was level and could not get 1.6 Quarts in the front one.

The Rear oil was golden. The front was thick. I ran a couple searches here for "gear oil", "capacity", "differential", and no luck.