Why do long haul truckers warm up their engine for 30 minutes before leaving?
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Trucker and mechanic here. It’s unnecessary and wasteful. 2 minutes should be enought to fill the air. Pre trip is best done with the engine off so you can hear air leaks. The best way to warm am engine is gentle driving. Most newer trucks have water cooled turbos so the heat cracking and oil getted burned inside doesn’t happen like it used to.
Some drivers do it to power accessories or run ac or heaters, but many battery and solar systems exist. Diesel heaters for the winter will burn 3L a day instead of 5L per hour.
Idling is also terrible for modern emission control devices. my customers that have issues and complain idle a lot. Guys pulling 65 ton b trains don’t have problems.
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