Automatic Transmission Fluid (ATF) (H3)
ATF types are categorized by their specifications, such as DEXRON, MERCON, and Mercon LV, or by transmission type, including fluids for traditional automatics, CVTs, and DCTs. Key features of a quality ATF include viscosity for temperature adaptability, anti-wear properties for lubrication, heat dissipation to prevent overheating, and additives for oxidation resistance and seal conditioning.
Types: (H4)
- Traditional ATF: General Motors' DEXRON and Ford's MERCON are common specifications for traditional automatic transmissions.
- Manufacturer-specific fluids: Some manufacturers, like Chrysler (ATF+4) and Honda, have their own specific ATF formulations.
- Continuously Variable Transmission (CVT) Fluid: These are lighter than traditional ATFs and are specifically designed for the unique requirements of a CVT, which does not have fixed gears.
- Dual-Clutch Transmission (DCT) Fluid: A specialized fluid for DCTs, which are a type of automated manual transmission.
- Low Viscosity ATF: A newer category of fluid designed for modern transmissions that require lower viscosity for better fuel efficiency.
Key Features: (H4)
- Lubrication: Reduces friction and wear on gears, bearings, and clutch plates.
- Cooling: Absorbs and transfers heat away from transmission components to prevent overheating.
- Hydraulic pressure: Acts as a hydraulic fluid to transmit power for shifting gears.
- Corrosion and oxidation resistance: Contains additives that protect internal metal parts from rust and degradation.
- Seal conditioning: Keeps gaskets and seals flexible to prevent leaks.
- Viscosity: A fluid's thickness, which needs to be suitable for a wide range of temperatures to ensure smooth shifting in both cold and hot weather.
- Friction stability: Maintains stable friction characteristics to ensure smooth gear changes.