What is the engine oil capacity for a 2003 gmc sierra 2500 6.6 liter hd diesel truck?
The oil capacity for a 2003 GMC Sierra 2500 HD with the 6.6L Duramax diesel engine is approximately 12 quarts. However, it's always best to check your owner's manual for the precise amount. The actual amount might vary slightly depending on the oil filter used.