Where is the transmission dipstick located on a 2001 Oldsmobile Alero?

It won't have one. The owner's manual will specify what the time intervals are for a fluid change. If you lost the owners manual, you will have to go and ask the dealer.

AnswerThis transmission in the Alero, Grand Am, and Malibu has a fill cap. On the side of the trans near the bottom is a plug you remove to check the level; similar to a rear end or manual trans. The car needs to be running in park and jacked up level.