Transmax™ Full-Synthetic Dexron-VI™/Mercon-LV™ Automatic Transmission Fluid, 1 Quart by Castrol®. Oil Base: Full Synthetic. Oil Type: Dexron-VI™/Mercon-LV™. Volume: 1 Quart. As automatic transmissions become more complex there’s a need for more technologically advanced fluids to ensure vehicle reliability. Getting the right oil for your car is key to ensuring your transmission operates as designed and maintains performance throughout the lifetime of the vehicle. Castrol, with over 100 years of experience in developing transmission fluids, and being the choice of many leading truck and transmissions manufacturers for factory-fill products, offers a range of automatic transmission fluids for your vehicle requirements; providing you the peace of mind that you are getting the right oil for your vehicle and keeping your vehicle on the road longer. Castrol Transmax™ DEX/MERC includes enhanced friction durability for smooth transmission performance. Designed for use in older GM and Ford vehicles and meets both DEXRON-IIIH and MERCON requirements.