Best 1 Gallon Transmission Fluids of 2025

The Castrol High Mileage Transmission Fluid is specially engineered for transmissions with over 75,000 miles. It helps prevent or stop leaks and restores smooth shifting. With extra cleaning agents, it reduces varnish and sludge formation while providing superior transmission performance. It meets or exceeds General Motors DEXRON-IIIH and Ford MERCON requirements, and exceeds all passenger car and light truck manufacturer's warranty requirements.

Castrol Transmax ATF/CVT Universal Transmission Fluid is designed for most automatic and continuously variable transmissions, providing enhanced friction durability for smooth performance. With superior high-temperature protection and unsurpassed copper corrosion protection, this transmission fluid is an excellent choice for Ford, GM, Chrysler, and Asian imports.

Get the Trans Fluid One Gallon that is manufactured in the United States. This product is designed to be easy to install and adds an attractive accessory to your vehicle.

Lucas Oil Synthetic ATF offers excellent performance for your vehicle's transmission system. Its durable friction modifiers ensure smooth gear shifts, helping you avoid any annoying chatter or noise. The low-viscosity formula is designed to meet the specifications of many original equipment manufacturers, giving you peace of mind that you’re using a compatible product. With a synthetic base oil, this fluid promises long-lasting performance and protection against oxidation, as well as the buildup of harmful sludge. This means you can enjoy a more efficient and reliable driving experience.

Hot Shot's Secret Adrenaline Speed Shift (SS) Transmission Fluid is a high-quality transmission fluid designed to enhance your vehicle's performance. This transmission fluid helps reduce extreme heat, promoting non-slip shifts and increasing response time. It also improves horsepower by up to 3% over the leading national brand. With its 100% PAO formula, it provides excellent protection against wear. The Hot Shot's Secret Transmission Fluid is perfect for anyone looking to improve their vehicle's transmission performance and overall driving experience.

The Genuine Chrysler AS68RC Automatic Transmission Fluid is designed for use in transmissions made by Aisin-Warner, specifically the DC/DM body AS68RC. This OEM Chrysler fluid provides excellent lubrication and is foaming resistant, ensuring that your transmission runs smoothly and efficiently.

The Red Line Synthetic Automatic Transmission Fluid (ATF) is a versatile product that can be used in a variety of applications, including automatic and manual transmissions, power steering, and more. It is recommended for use in Toyota, Honda, Nissan, BMW, and Audi/VW automatic transmissions, as well as manual transmissions and transaxles. Additionally, it provides excellent cold weather operation and gear protection at a GL-4 level.

This transmission fluid is designed to reduce noise, vibration, and extreme heat while guarding against wear and improving oxidation stability. It's an ideal choice for anyone looking to protect their transmission and improve its performance.

Hot Shot's Secret Transmission Fluid is a high-performance fluid designed to enhance your driving experience. It helps reduce extreme heat, ensuring your transmission runs smoothly even under pressure. This fluid promotes non-slip shifts, giving you precise control over your vehicle. With increased response time, you can enjoy quicker gear changes for a more dynamic driving experience. Additionally, it improves horsepower by up to 3%, providing a boost in performance over other brands. Lastly, it protects against wear, prolonging the lifespan of your transmission.

Castrol TranSynd 668 Allison is a high-quality transmission fluid that offers improved gear protection, extended anti-shudder and clutch-friction durability, and excellent resistance to corrosion, foaming, and thermal and oxidative stability. This transmission fluid is a reliable and long-lasting solution for your vehicle's transmission needs.