5 minutes was max for my personal car i just stated that because nothing happened to me yet so far. , I never run any z without coolant for more than a minute that I don't own. I typed up the post on my phone so it was a lot of typing, but apart from monitoring the engine temp? When I add the coolant to check to see if the thermostat opens around right temp ill use consult!. Sorry if my spelling isn't the best. Sorry you've heard anything bad sir! I just started working for him last year, and every car so far has been amazing! I'm 22 so I have a lot to learn.