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AMSOIL Multi-Vehicle Synthetic Automatic Transmission Fluid and Fuel-Efficient Synthetic Automatic Transmission fluid have been designated as part of the company’s Signature Series. The performance of the ATF’s was severe-service tested which validated the expanded service life recommendations. Signature Series ATF is recommended for twice the vehicle manufacturers’ severe-service drain interval. AMSOIL Synthetic ATF is formulated to improve fuel efficiency, reduce transmission temperatures and increase equipment life. The products also feature new packaging.