GMC 1996 Suburban Owner's Manual page 326

Cooling System Capacity (Approximate)
After refill, the level must be rechecked. See "Cooling
System" in the Index.
ENGINE
QTY Without Rear Heater
"VORTEC" 5700
"VORTEC" 7400
R
J
17.5 Quarts (16.5 L)
25 Quarts (23.5 L)
Crankcase Capacity (Approximate)
VIN
R
J
After refill, the level must be rechecked. See "Engine
Oil" in the Index.
ENGINE QUANTITY TH
"VORTEC" 5700 5
Quarts (4.8 L)
"VORTEC" 7400 7 Quarts (6.5 L)
?Oil filter should be changed at every oil change.
QTY With Rear Heater
20 Quarts
(
19 L)
27.5
Quarts (26 L)
6-72