Why do long haul truckers warm up their engine for 30 minutes before leaving?
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It’s called Proper Operating Temperature. It’s kind of self-explanatory. You can cause severe damage to the engine if not at the proper temperature before putting the engine under the strain of a load.
Even modern Heavy Engines, which have computer systems which mitigate operating at low temps still require air tanks to be filled to operating pressure and tested. Also, any good driver has a Federally Regulated Equipment Inspection they required to do before starting their work day which takes between 15 and 30 minutes.
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