Apparently I'm not the only one who finds the Aveo very slow to warm up, especially for such a small car. I'd like to hear all possible reasons that might be contributing to this.

I can think of several possibilities, but there may be more:

1. Relatively low temp of the original thermostat.

2. Relatively low spark plug temp of originals. (Hotter plugs might be better.)

3. An unusually large capacity of the oil system. (It holds at least 5 full quarts.)