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The 2003 Chevy TrailBlazer was equipped with a 4.2 L 6-cylinder engine as standard across all trims. There were no options for upgrading the engine, so every model came with this same engine. It is recommended to use synthetic 5W-30 oil for this engine. For those living in very cold climates, using 10W-30 oil is advised to prevent freezing. The oil capacity, including the filter, is 7 US quarts, which is relatively high. Expect to spend approximately $40 to $50 to fully fill up the vehicle with oil.
The recommended oil for a 2003 Chevy Trailblazer is full synthetic motor oil with a viscosity rating of 5W-30.