For example 91 ° C (195 ° F) the life of the fluid is reduced to 80,000 km. As a general rule, every 6 ° C (20 ° F) average increase in operating temperatures above 80 ° C will shorten life. Under normal driving conditions the fluid temperature reaches 80 ° C (175 ° F), If it is kept at that temperature the fluid can last up to 160,000 km At 105 ° C (220 ° F) - it is the most common temperature in many transmissions - the ATF only works for 40,000 km and so on the protection mileage is reduced.ĭo not risk suffering a mishap related to the transmission fluid automatic, make the change in the corresponding period and avoid paying more for not doing it. In the end, the only way to repair the damage is an overhaul, which comes at a considerable cost.Īs a general rule, every 6 ° C (20 ° F) average increase in operating temperatures above 80 ° C will shorten life. Eventually the clutch burns out and the gearbox stops working. Also at high temperatures the transmission begins to slip, which further aggravates the heating. If the fluid temperature exceeds 120 ° C (250 ° F) the rubber seals harden causing leakage and loss of pressure. While heat destroys the lubricating qualities and friction characteristics of the fluid, at the same time enamel begins to form on internal parts which interferes with the operation of the transmission. If it is kept at that temperature the fluid can last up to 160,000 km and otherwise if the temperature rises (even under normal driving conditions it can pass) the life of the ATF is reduced causing the problems to start.ĪTF oxidizes, changes color (brown) and produces an odor similar to burnt bread. Under normal driving conditions the fluid temperature reaches 80 ° C (175 ° F), which is the average range in which the most liquids were designed to operate. When this heat is produced, the ATF quickly warms up once the vehicle is in motion. In an automatic transmission a lot of heat is generated due to the friction within the torque converter, when the clutch plates engage and that created in the gears and rotating guides. Below we will give the reasons why ATF should be replaced on average every 40,000 km. Most user manuals state that The automatic transmission is filled for life. The original article is in Spanish and I had ask our friend Google for some help with a little input from me. I might pop in tomorrow and visit him.Ī few years ago he used to make torque converters which he delivered to shops in Norway and Sweden. There is a guy who repairs gearboxes down the road from my place. Here is an interesting note about automatic transmissions and temperatures.
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