I own an ‘05 Chevy 1500 pickup truck. The trans takes a Dextron III. Can I put in a synthetic fluid like Mercon V or similar?

I own an ‘05 Chevy 1500 pickup truck. The trans takes a Dextron III. Can I put in a synthetic fluid like Mercon V or similar?

It is not recommended to use anything but what the manufacturer has specified.

—Gerald Wheelus
Edgewood Auto Parts #253, Edgewood, Texas

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