Normally, change tranny oil every 40K or check your owner's manual. I usually send my car to gasoline stations for minor PMS like change oil,brake fluids, coolant etc but you may consider speedyfix, Migs gives a lam sum pricing or maybe Toyoya , a Metrobank group gives 10% off in parts & labor for major PMS. But personally, I change Tranny oil every 30K or whenever I feel my cars starting to consume more gas than before. Pag feeling ko bumababa na ang FC at saka humihina na rin ang hatak specially sa MT ay change tranny oil na ko....