What year did Cadillac put push to start in their cars?

Answer 1

They had push-button start on all vehicles back in the 20s 30s 40s and 50s but you still had to insert and turn a key to the on position before pushing the starter button. But I assume you mean key-less ignition systems as we see on modern vehicles. Cadillac introduced this in 2007 on the CTS. Mercedes Benz was the first company to install this Siemens system in 1998 on the W220 S-Class.