Prestone ATF + Stop Leak Automatic Transmission Fluid. A high quality ATF designed to meet or exceed the needs of many cars on the road today. This product can help delay or eliminate the need for costly repairs by helping to stop leaks and condition dry and cracked seals. It's high and low temperature friction characteristics provide smooth shifting in extreme conditions. Meets all recommended requirements of vehicles serviceable by Dexron III or Mercon fluids.