Shell Spirax S4 ATF HDX is a high-quality automatic transmission fluid designed for intensively used systems in passenger cars and road vehicles. Thanks to the use of synthetic base oils, this product offers excellent lubrication properties, which allows for significantly extended oil change intervals in automatic transmissions, even under difficult operating conditions. The fluid is characterized by increased shear stability, high resistance to high temperatures and provides excellent fluidity at low temperatures, which translates into smoother gear changes and protection against wear.