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I have a 2005 Chevy 1500 pickup truck. The trans takes a Dexron-III. Can I put in a synthetic fluid like Mercon-V or similar?

I have a 2005 Chevy 1500 pickup truck. The trans takes a Dexron-III. Can I put in a synthetic fluid like Mercon-V or similar?

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Dexron-III (3) was phased out in favor of Dexron-VI (6), and Dex-VI is backward-compatible with previous Dexron fluids. While many multi-vehicle ATF’s claim compatibility with older Dexron fluids as well as Mercon-V (which is a Ford specification), I would not recommend Mercon-V in your GM application. Stick with Dexron-VI if you prefer a synthetic fluid, or use the Dexron-III formulations from a reputable supplier.

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Thomas Dayton
Assistant Manager
J S Auto Supply in Jamestown, N.Y.

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