PREHEATING IS IMPORTANT. A single cold start without proper preheating can produce more wear on your engine in less than a minute than 500 hours of normal cruise operation. I'm often asked how cold it has to be before preheating is necessary. There's no hard and fast answer, because the damage done by an unpreheated cold start depends on a variety of things, including the type of engine, its age and condition, and what kind of oil is being used. A brand-new or freshly rebuilt or overhauled engine is more vulnerable to cold-start damage than a tired old engine at TBO.
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