What is the engine oil capacity of 2002 GMC 8.1L?

The engine oil capacity for a 2002 GMC with an 8.1L engine is approximately 7 quarts (or about 6.6 liters) when using a standard oil filter. If you're replacing the oil filter as well, it's advisable to have around 8 quarts on hand to ensure you have enough for a complete oil change. Always refer to the owner's manual for specific recommendations and capacities.