To find the exact engine oil capacity for your 2008 GMC C7500 with the 8.1L engine, I recommend checking the following resources:
* Your Owner's Manual: This is the most reliable source for information on your specific vehicle.
* The Oil Fill Cap: The oil fill cap on your engine may have the capacity listed on it.
* Your Local GMC Dealership: They can provide accurate information about your vehicle.
* Reputable Online Resources: Websites like AutoZone or CarParts.com often have technical specifications for different vehicles.
Please note: Oil capacity can vary slightly depending on factors like options and accessories. Always double-check the information you find with your owner's manual or a trusted source.