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While a drain and fill replaces only part of the fluid, a transmission flush uses a machine to pump new fluid through the system while removing nearly all old fluid, including that in the torque converter and valve body. This can replace 95–100% of the fluid, providing a more thorough cleaning and restoring friction modifiers to optimal levels .However, flushes can be controversial for high-mileage vehicles because pressurized fluid may dislodge built-up deposits, potentially causing issues
While a drain and fill replaces only part of the fluid, a transmission flush uses a machine to pump new fluid through the system while removing nearly all old fluid, including that in the torque converter and valve body. This can replace 95–100% of the fluid, providing a more thorough cleaning and restoring friction modifiers to optimal levels .However, flushes can be controversial for high-mileage vehicles because pressurized fluid may dislodge built-up deposits, potentially causing issues