You need to go to toyota or Lexus and buy some w/s atf world standard auto trans fluid. To check the level it's more like a manual gearbox, on the side of the box is a level bung. You have to run the engine for a couple mins go through the gears then check the level with the engine off but you must check it with in 2 mins overwise the oil from the cooler will run back into the box. Level should be just under the bung hole. You can go on to the Lexus tech section and pay for a hour session and look it up for the full workshop procedure. Hope that helps