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What type of Transmission Fluid is the best for 2003 Chevy Impala 3.4L V6?

The 2003 Chevy Impala 3.4L V6 uses Dexron III transmission fluid. However, Dexron VI is generally backward compatible and is often recommended as a superior replacement. Dexron VI offers improved performance and longevity compared to Dexron III.

Always check your owner's manual for the manufacturer's specific recommendation. While Dexron VI is often considered a suitable upgrade, using a fluid explicitly specified by GM is always the safest bet to avoid potential warranty issues or damage to your transmission.