Less guessing and more facts people.
Warm up is crucial for engine longevity. Pistons made of aluminum absorb heat and change size faster than your iron block. Cold start and quick high load makes the piston contact the cylinder wall causing wear.
Two stroke Detroit diesel engines used cast iron pistons and blocks so they would expand at the same rate. Thus making them superb for emergency vehicles (fire trucks) that need to go balls out as soon as they are started without compromising longevity.
And this isn’t just a winter thing. A 105° August day is not up to operating temperature for the internals for engines.
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