The correct way to shut down the engine When the vehicle is off, many of the masters are directly shutting down. This is the right way; it should be idle for 3 minutes to 5 minutes before the flameout. In doing so, the fan can be used to dissipate heat from the unloaded engine, allowing the engine to have a slow cooling process and at the same time increase the service life of the engine; secondly, the engine with the supercharger, and the turbocharger rotor after unloading. At high-speed rotation, the idle speed can maintain the oil pressure to lubricate the rotor bearings to avoid damage to the supercharger. Coolant selection Cummins engine coolant consists of three parts: pure water plus antifreeze (ethylene glycol or propylene glycol, concentration: 40% to 68%) plus additive (DCA4), here I recommend using Better than good Fleetguard coolant. Coolant