Originally Posted By: bdcardinal
If it were me, that fluid would have been drained and filled at 30k. The manufacturers have the 150k requirement because A. they think it works and B. it lowers the "cost to own" that magazines use now.
It really depends on the transmission. For example, Ford recommended 150K mile ATF changes for the short lived Ford 500, and considering the activity on 500 forums, this hasn't hurt the longevity of transmissions as I don't see anyone discussing AT problems or their options for rebuilding transaxles. On the other hand, the Aisin transaxles in the Ford Taurus were terrible. The manual stated 30,000 mile ATF changes, and a lot of guys on forums did the ATF changes, installed coolers, and the transmission still ate itself with less than 100K miles. I don't recommend following manuals blindly. However, having a look at the forums discussing the vehicle in question can reveal some things.