ON TOPIC! I found this in one of my bee rags.

From : craig

Q: i dont know anyone that ever changed the brake or power steering fluid on any of their daily drivers i do unlike the engine oil which is expected to be drained relatively often the transmission oil may last the life of the vehicle tell me - why do you think transmission fluid is immune to contamination break-down and general used-up-ed-ness that every other petroleum-based product exhibits and what other petroleum-based products are you referring to. i dont know anyone that ever changed the brake or power steering fluid on any of their daily drivers. as far as engine oil it is under much greater abuse and exposure then trans fluid was in the older transmissions. it was assumed that the trans fluid and filter would last until the trans needed actual service requiring removal of the pan. my 73 fsm suggested service at 100000 with normal driving so it made little sense to put a spin-on filter or drain plug on it but that seems to no longer be the case with these new overdrive automatics. it is too bad that the manufacturers have chosen to screw the customer in order to save a little money by not making the required changes. -- if at first you dont succeed youre not cut out for skydiving .