What is "dexron"

DEXRON is the trade name for a group of technical specifications of automatic transmission fluid created by General Motors (GM). The name is a registered trademark (later becoming a BRAND) of GM, which licenses the name and specifications to companies which manufacture the fluid and sell it under their own brand names.

Originally the DEXRON name was associated exclusively with automatic transmission fluids, later GM released DEXRON gear oils and other lubricants under the DEXRON brand.