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For the 2004 Chevy Tahoe Z71, you'll want to use 5W-30 synthetic motor oil. This SUV comes with a standard 4.8L V6 engine, but you can opt for a more powerful 5.3L V8 engine upgrade. The V8 doesn't offer significantly more horsepower, but it does deliver a notable increase in torque. Both engines require 6 US quarts of oil with the filter included, and they share a 15mm head size oil drain plug. To remove the plug, apply 20 ft-lbs of torque.
The 2004 Chevy Tahoe Z71 requires 5w-30 synthetic oil. When buying oil for an oil change, plan to spend approximately $30 for the 6 quarts needed for your engine.