Idle air control valve or oxygen sensor or what?

\\ The oil temp gauge would not move until I had been driving a few miles. It would not reach a good temp for oil for 5 miles driving 55 mph. Water temp could be at optimum temp in 2 minutes in the summer. A bit longer in the winter but I in Georgia where winter might get below freezing 14 days. My 2003 does not have an oil temp gauge. My 84 did as it was a GTI. Many cars do not have oil temp gauges which is really the way to tell if an engine has really warmed up. Most gas cars will hit warm engine water temp a few miles or more before the oil temp has gotten properly hot. My water cooled gas cars are making enough heat to be comfortable a mile from my house in the winter. Why would I waste fuel letting the car idle? Sorry I came from a frugal house where there was little if any warmups done on the family cars unless it was 0F or colder.

I must say that no one I know starts a car and lets it idle. Even less likely in the US as fuel prices are double or triple what they were a year or a few years ago. I even see trucks driving the posted speed limit now as trucking companies try to save on their biggest expense fuel. I see more people turning off their cars as the wait in the queue at the fast fat food restraints.