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It idles high when it's cold to help it (and the catalytic converter) get up to temperature so that is runs more smoothly and emits less pollution. As to letting your car warm up, it can take up to thirty seconds for oil to reach the top of your engine, so it's not unreasonable to give your car some time to get to that point. Most newer cars situate the oil filter higher on the engine to reduce this time. Anything above and beyond that amount of time is a waste. To be honest, if you speak to people who have 400,000+ on their cars, they seldom have any ritual of waiting for the car to warm up before driving.

Taking an engine to redline that isn't warmed up to full temperature isn't good for it. But, even at sub 0 weather (like today here in WI) my engine still gets to full temperature within a mile from home.

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since you didn't mention the car's make, model, year, engine, miles, like most people, I will assume it is a 96 honda accord, :) it doesn't matter. the only way that could be bad is if you have to high viscosity oil. since its a 96 honda accord I decide in cold weather since oil is thick when its cool I would you a 5w-30. if it has an oil pump thats working how it should, the right oil, engine warm. rev it to as high as you like cold weather makes cars happy. the engine is balanced and is not effected by the outside temp. other than the air might be a little more dense(that meens it runs better.)

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sorry hope you can make sence of that my keyboard is not the best.

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