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From our 1983 owner's manual - surely identical specs for your 80?
"Rear axle oil
Capacity: 1.7 US qts - 1.6 liters
Oil type: API GL-5 (MIL-L-2105 B or C)
Viscosity: SAE 90
Replace: at 600-1,200 mile (1,000-2,000 km) service only.
The oil level should be up to the filler plug (A).
Drain rear axle oil through drain plug (B).
When the temperature is steadily below 15° F (-10° C), use API GL-5 SAE 80 W oil.
Cars equipped with limited slip differentials should use oils with proper additives."
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Bob (81-244GL B21F, 83-244DL B23F, 94-944 B230FD plus grocery-getter Dodge minivan, MGB, and numerous old motorcycles)
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