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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There all related, friction is the enemy (wear, performance, fuel consumption), which is the highest when cold. That is why the new engine in the 240, is designed to stay warm for up to 18 hours after shut down.
F1 motors tolerances are so tight they are effectively seized until warm, they heat the fluids prior to start.
low rpm(once started, oil pressure equalized) light load until warmed up.