Does it really matter what fluids are used when a service or part requires topping off of a system? We build several transmissions a year because an improper fluid was not used. Some businesses will use a less expensive universal fluid and then use an additive to allegedly convert the fluid to the proper characteristics. Why would a business even attempt this? Profit margin. Some transmissions, transfer cases, differentials and even power steering units, require expensive fluids. Always use the proper oem fluid. Don't trust any product which claims to be an equivalent. Think about your favorite meal your Mom makes, are really going to be happy when ingredients are substituted? It is not going to be the same. Cars want and need the real McCoy.
We offer full turkey transmission service. Short Video I talk about transmissions.