The Massey Ferguson 35 tractor model requires 12.5 pints of transmission oil. For this model, the recommended oil is SAE 80 grade oil or SAE 90 grade oil. Both types of oil are available in non-detergent or detergent varieties. Non-detergent oil is recommended for earlier models of the Massey Ferguson 35, while later models can use either type of oil. It is also important to make sure the oil is specifically designed for use in agricultural equipment.