How much refrigerant oil does a 2003 Denali with rear air hold?

A 2003 GMC Denali with rear air conditioning typically holds about 8 ounces of refrigerant oil for the entire system. However, it's important to check the specific service manual for your vehicle or consult a professional, as the amount can vary slightly based on the specific configuration and any repairs or modifications made. Always ensure to use the correct type of oil recommended for the refrigerant used in the system.