PENNZOIL HIGH MILEAGE VEHICLE™ ATF DESCRIPTION. PENNZOIL® HIGH MILEAGE VEHICLE™ ATF is a fully synthetic transmission fluid for automatic transmissions with high mileage. The oil is designed based on the high-quality synthetic base oils and specially selected additive package. It is intended for use in old transmissions and transmissions with high mileage, transmissions subject to long heating. It is also recommended for automatic transmissions with the mileage higher than 75,000 miles. This oil helps in reducing sludge and deposit formation on transmission parts and clutch. APPLICATION. PENNZOIL® HIGH MILEAGE VEHICLE™ ATF is specially designed for automatic transmission with high mileage, but you should follow the manufacturer’s recommendations for its replacement time. It is suitable for use in all automatic transmissions and autos requiring the following fluids: GM DEXRON®-III, Ford MERCON®, Allison C-4 and Caterpillar TO-2.