![]() ![]() Synthetic ATFs closely resemble the properties of Dexron and Mercon. Popular products ATF+ and 7670 are both HFMs. They are often, though not exclusively, used in European high-performance vehicles. Highly Friction Modified (HFM) Fluids are synthetics. Dexron and Mercon are the basis for many other ATFs sold under different names. The big step forward over Types A and F is the addition of friction modifiers – molecules that coat surfaces, thus reducing friction and heat buildup. Both are very similar and are used in American and imported vehicles. However, there’s a thriving classic and collectors market out there, so you shouldn’t have any trouble finding appropriate grades of these automatic transmission fluids.ĭexron and Mercon are arguably the most common traditional ATFs. Type A and Type F are traditional ATFs that haven’t been used in new cars since the 1970s. However, there are a large number of older vehicles still on the road, and there are specific fluids to suit them. As almost all synthetic ATFs are compatible with traditional ATFs (you can mix the two together so long as the synthetic ATF is the same grade), synthetic ATFs are beginning to dominate. Synthetic ATFs are more durable and resistant to the damaging effects of heat in modern transmissions. Synthetic automatic transmission fluids are man-made chemical polymers that perform the same functions. Traditional (or regular) automatic transmission fluids are made from natural oils that are combined with antioxidants and corrosion inhibitors. There are two basic types of automatic transmission fluids. Unfortunately, names, codes, and packaging can be confusing. There’s one golden rule with automatic transmission fluid: always buy the grade that the maker of your vehicle recommends. Manufacturers use a variety of approaches, and many American cars can’t use the same automatic transmission fluids as vehicles from Europe or Asia. The way cars are built and the materials used have changed a lot in the last 50 years. It also needs to be durable – it can’t break down when it gets hot or under extreme pressure.ĭifferent automatic transmissions have different demands. To do these things, automatic transmission fluid needs precise viscosity to suit the transmission concerned. What is automatic transmission fluid?Īutomatic transmission fluid (ATF) needs to do two basic jobs: lubricate bearing surfaces and dissipate heat in vehicles with automatic transmissions. Two, so it isn’t confused with engine oil. Why is automatic transmission fluid dyed red, pink, or green? Two reasons. ![]()
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