Heat is the number one enemy of any automatic transmission. When a vehicle is pushed beyond its design limits—specifically during heavy towing or carrying maximum payloads—the transmission works significantly harder. This extra work generates friction, which in turn generates intense heat. If the temperature of the transmission fluid rises above its optimal operating range, it begins to "oxidize" or burn, losing its ability to lubricate.

Many SUV and truck owners make the mistake of towing heavy trailers without checking if their vehicle is equipped with an auxiliary transmission cooler. Without proper heat dissipation, the seals inside the transmission can harden and crack, leading to internal leaks and pressure loss. If you frequently drive in hilly terrain or hot climates while carrying heavy loads, it is essential to monitor your transmission temperature. Changing the fluid more frequently than the standard manual recommendation is also a wise investment for "high-stress" drivers. Remember, once the fluid smells burnt or looks dark brown, the damage to the internal friction plates may already be irreversible. Click here to know more.