Quote:
Originally Posted by Sportstick
Let's put aside efficiency, emissions, and performance just for the sake of the argument. Does anyone disagree that, purely from the point of view of engine wear and tear, a gradual warm up is the best approach, for example, 20-30 seconds of standstill after cold start, and then nothing over ~2500 rpm for first 5-10 minutes (as we are not blessed with a temperature gauge)? My experience is that most physical matter doesn't like to change states quickly (cold to hot, for example).
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No, I don't agree. Why would the engine care if it's at 2000 rpm standing still or driving, it looks the same to it. And you're probably not going to be fully burning the fuel if you're not going a little bit above that. Plus, the exhaust gases aren't going to be hot enough to warm up the cats. The whole "let it idle for 30 seconds" comes back from non-synthetic oils, where the viscosity wasn't right for the engine at cold temperatures. Now oils are engineered to work fine throughout a cold start temperature range.