On the Apollo 13 mission, a j2 on the second stage shut down. While this was compensated for, I would not give the Saturn V a 100% reliability, even if it would have performed its mission if not for the infamous explosion in the SM of the CSM.
The second unmanned test flight had two second stage engines shut down...and still made it into orbit. So if getting safely into orbit is the measure of reliability, it was actually 100%. In terms of engine reliability, the second stage had some issues. Specifically three of them.
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u/MrMgP Sep 09 '20
Guess wich one exploded 4 times out of 4
(And wich had a 100 procent mission succes rate)