I just picked up a 2004 SR5 4Runner V6 with 4speed transmission. How often do you guys recommend filter and fluid change for daily street driver. It has 140K and according to car fax it was done at dealer 3 years ago and 15K miles. I am a firm believer in Transmission maintenance and would like to do it. Any thoughts or recommendations such as dealer or independent? Thanks and I love this rig!