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In 2005, the Chevy TrailBlazer calls for SAE 5w-30 fully synthetic motor oil. The 4.2 liter engine requires 7 quarts of oil for a complete change. You can easily find this popular oil in one-quart containers at various retail stores, auto shops, and online stores. Prices range from $2.95 to $15.35 per bottle, and you'll need at least 6 bottles for the oil change. To start, loosen the drain plug at the bottom of the oil pan, then unscrew the cap at the top. You can use a funnel costing between $1 and $5 to slowly pour the quarts of oil into the engine until it reaches the appropriate level.
The 2005 Chevy Trailblazer requires 5 quarts of SAE 5W-30 synthetic motor oil designed specifically for the Chevy Trailblazer 2005 model.