Are dexron 3 and 6 interchangeable?

Dexron III and Dexron VI are not completely interchangeable. While Dexron VI is backward compatible with Dexron III, using Dexron III in a vehicle designed for Dexron VI may not provide optimal performance and could lead to potential issues. It's always best to follow the manufacturer's specifications for Transmission Fluid to ensure proper function and longevity.