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The Chevy TrailBlazer with a 4.2L engine requires 7 quarts of oil for an oil change. Chevy advises using full synthetic oil for better protection and longer-lasting performance. Synthetic oil is designed to outlast conventional oil, so you won't need to change it as often. Typically, synthetic oil can go up to 7,500 miles between changes, compared to 3,500 to 5,000 miles for conventional oil. It's a good idea to check your oil monthly to ensure it's at the proper level and doesn't show signs of debris or burning.
The 2007 Chevy Trailblazer with a 4.2-liter engine has a total oil capacity of 7 quarts.