This situation reduces the ability of the fluid to lubricate the internal parts, causing the next two problems we will discuss. This pressure doesn’t just cause fluid to leak out and overheating, but it can also bring air contamination in with it.Īir contamination happens because the gears rotating inside are splashing liquid around, which causes a chemical reaction producing air bubbles and foam. Pressure BuildupĪs we just touched on, putting more fluid in the transmission than it needs increases the pressure inside. If it leaks out of the gearbox, seals are going to be broken, which reduces the lubrication on the gearbox, causing overheating. However, when you overfill the transmission, there is going to be some leakage from the buildup. By using too much of it, you could cause an overheating situation, which sounds a little backward at first. Transmission fluid is responsible for keeping the transmission cool. Here are some other consequences of overfilling your transmission fluid in detail: Overfilling Your Transmission Fluid ConsequencesĪ few problems may occur if you overfill your transmission fluid, and here are the four most common issues. It is often quite easy to drain some transmission fluid, and definitely worth doing if you have an expensive car. If you are driving a newer car with a DSG or CVT transmission, it may be a bad idea to drive around with too much transmission fluid. If you overfill your transmission with 1 quart or more, you should definitely consider draining it. However, if you overfill it with 1/2 quartz or less, there is usually no need for action. Overfilling the transmission can adversely affect the performance of your transmission. Recheck the Fluid Level What happens if you overfill transmission fluid?
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