Automatic transmission fluid (ATF) is a crucial component in the operation of automatic transmissions, yet there are several myths and misconceptions surrounding its use and maintenance. To make informed decisions about your vehicle’s ATF, let’s debunk some of these common myths:

Myth 1: ATF never needs to be changed:

One prevalent myth is that ATF is a “lifetime” fluid that never needs changing. While modern ATFs are engineered to last longer, they still degrade over time due to heat, contaminants, and wear. Regular ATF changes are essential to maintain the transmission’s longevity and performance.

Myth 2: You can use any ATF:

Not all ATFs are created equal. Each vehicle manufacturer specifies the type and grade of ATF suitable for their transmissions. Using the wrong ATF can lead to damage and affect shifting performance. Always follow the manufacturer’s recommendations for ATF type and viscosity.

Myth 3: Thicker ATF is better for older transmissions:

Some believe that using thicker ATF, such as a higher viscosity grade, can improve the performance of older transmissions with worn parts. This is untrue. Using the wrong viscosity can hinder proper lubrication, leading to transmission problems. Stick to the recommended ATF grade.

Myth 4: Adding more ATF improves performance:

Overfilling the transmission with ATF can be just as detrimental as underfilling it. Both conditions can lead to issues like foaming, overheating, and erratic shifting. Always maintain the ATF at the recommended level indicated in your owner’s manual.

Myth 5: ATF additives are beneficial:

There’s a misconception that adding aftermarket ATF additives can enhance the performance of transmission fluid. In reality, modern ATFs are already formulated with a precise balance of additives to meet specific requirements. Adding extra additives can disrupt this balance and potentially harm the transmission.

Myth 6: Flushing the transmission is harmful:

Properly performed transmission fluid flushes are beneficial and recommended maintenance procedures. A flush replaces old, contaminated ATF with fresh fluid, effectively cleaning the entire system. However, a poorly executed flush can cause issues. Always seek professional service from reputable technicians.

Myth 7: Dark ATF indicates the need for a change:

While dark or discolored ATF may be a sign of contamination or wear, it’s not the sole indicator for an ATF change. A regular change interval, as recommended by the vehicle manufacturer, is more reliable than relying solely on the color of the fluid.