Mobil ATF 320 is an extra high performance automatic transmission fluid. It is recommended for most passenger car and commercial automatic transmissions. It is also suitable for power steering systems, hydraulic applications and some manual transmissions where an automatic transmission fluid is specified. Mobil ATF 320 is recommended for most passenger car and commercial automatic transmissions. It is also suitable for power steering systems, hydraulic applications and some manual transmissions where an automatic transmission fluid is specified.