My new Cummins starts right up at -10 without being plugged in to block heater. New gen diesel all start up with no smoke and hardly any noise. My Duramax ( just sold it) has no-wait time to start even when it's below zero . I love the new super quiet Cummins,awesome low rpm torque and really usefull exhaust brake controlled wwith the Variable Turbo set up. 19 MPG and still only new (1200 kms).