2018 Subaru Outback Front and Rear Differential - 125k miles - Subaru 75w-90 HP Gear Oil

How much does each hold? My 18 rogue barely holds a qt between the 2. After draining what looked like 10 yr old fryer grease from the front @40k I'm a little over the top and do it every spring.
 
How much does each hold? My 18 rogue barely holds a qt between the 2. After draining what looked like 10 yr old fryer grease from the front @40k I'm a little over the top and do it every spring.
Rear diff is like 0.8 quarts, front diff is 1.5
 
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