The reason why I questioned if it was an auto with that milage. If the oil has not been changed, it could cause lots of problems with gear slip as the box replies on the particles in the oil to change gear. If you suddenly change the auto box to fresh oil it could lose drive.
Its important to change auto box oil to the manafacuerd specs! Or every 30-40k depending on use, just to be on safe side.
A manual gearbox would enjoy a gearbox oil change to the correct spec