When the transmission in my car was rebuilt (after 110K), the tranny shop tech told my parents that they should keep the fluid three quarts high to help it last longer (or something to that effect). After I got it serviced not too long ago at the dealership they filled it to the normal level. I began having problems with it slipping a little. I remembered what the other guy said and filled it some more (only 1 quart) and the slipping stopped. Since I'm not a transmission guy I was wondering if this would have any negative side effects on my transmission and the tranny guy was blowing smoke out of his posterior.