GMC 2000 Sierra - Manual (Page 377)

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Crankcase Capacity (Approximate)
After refill, the level must be rechecked. Add enough engine oil so that the fluid is within the proper operating range.
See “Engine Oil” in the Index.
Engine VIN Quantity with Filter
[
VORTEC 4300 V6 W 4.5 quarts (4.3 L)
VORTEC 4800 V8 V 6.0 quarts (5.7 L)
VORTEC 5300 V8 T 6.0 quarts (5.7 L)
VORTEC 6000 V8 U 6.0 quarts (5.7 L)
[Oil filter should be changed at every oil change.
Fuel Tank Capacity (Approximate)
Type Quantity
Short Bed 26.0 gallons (98.0 L)
Long Bed 34.0 gallons (128.0 L)
Chassis Cab 34.0 gallons (128.0 L)