The question of whether or not to warm your engine in cold weather is the source of never ending debate. It doesn't matter whether you're a car person or you can't tell a spark plug from a hair plug, you probably have an opinion on the morning warm-up. Based on what I understand technically, I am against the morning warm up for gasoline engines. Diesels are a different story, because they rely on engine warmth to build up enough compression to run smoothly and efficiently. But a gas engine at cold idle sits there and spews pollutants into the air that would be eliminated with a quicker, driving warm-up. Some of you are thinking about lubrication, and the fact that your slow-moving cold oil
won't be able to get to the top of the engine to lube your valves and such. Modern oil pumps can move oil fine when its cold. Further, in the old days an engine only had one or two ways to get oil from the oil pan at the bottom to the valves at the top. Modern engines have oil squirters all over the place, bathing valves, cams and other parts in oil as soon as the engine is moving. So I stand by my no-warm-up statement. There are some valid exceptions, of course, such as a mother who has to put young children in the car -- as a parent I understand that there's never a good reason to make the day uncomfortable. I came for opinions, so let them fly!