Didn't start leaking oil until I replaced the serpentine belt tensioner. Could this be from the crankshaft pulley being not lined up correctly when putting the belt back on?

What is your question?

Oil leaking just recently after changing serpentine belt tensioner. I didn't notice any leaking before the tensioner replacement

What makes this problem better or worse?

Leaks even when not running

How long has your 1997 Cadillac Seville had this problem?

About a week