My use of ISO 32 above is incomplete, this defines the viscosity. The standard for the oil is ISO 11158. Also note that ISO 32 viscosity is equivalent to SAE 10W, SAE 30 is similar in viscosity to ISO 100 (100 centistokes).
Finally as Robert says some grades of ATF containing anti wear additives (Zinc dialkil dithiophosphate) can react with yellow and white metals.
hth
Dave