Why do long haul truckers warm up their engine for 30 minutes before leaving?
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Heavy equipment operators do the same thing. Anything with a big diesel engine and a lot of hydraulic systems need to be fully warmed up to operating temperature, or you risk popping a hose, seal, or gasket (or worse).
When I worked in open mines, the large machines and trucks were only ever really shut off when you were getting fuel. Especially in winter.
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