PENNZOIL® ATF Dexron®-VI is a specially developed automatic transmission fluid for General Motors autos. It exceeds Dexron®- III(H) ATF service life two times and ensures the high efficiency of new and old transmissions. It is resistant to oxidation, reduces friction, guarantees shear resistance and protects from wear. It ensures smooth gear shifting. Shear resistance compared with Dexron®-III (H) ATF. Synthetic automatic transmission fluid. Specifications and approvals. PENNZOIL® ATF Dexron®-VI is recommended for all autos from 2006 and earlier made by GM where Hydra-Matic transmissions are installed. PENNZOIL® ATF Dexron®-VI complies with GM GMN 10060 specifications.