The car is just more or less broken in. 1800 miles. 2AZFE engine (more or less the same 2.4L 4cyl in the Camry. Still on factory fill oil (5w30), which I've decided to run out to 5000 miles before switching to 5w30 PP. So let's say I pulled into a rest area and wanted to sleep in the car at night in the hellacious southern summer heat,(yes I am aware of carbon monoxide issues -- it's a new car with new exhaust and I'd leave the outside ventillation blowing fresh air in) , so I left it idling 6-8 hours. Just how bad would this be for the motor, and why? I read here a while back while all modern motors don't depend on the old "splash" (Model T type) of lubrication, they still more or less count on a "cloud of oil droplets" that the sump is filled with when the motor us running at operating RPM range, and that at idle the motor therefore wears more. Other than that, and I don't even know if it's true, I can't see why a gasoline motor with good oil and filter would wear a heck of a lot just idling for a few hours. Also, if "cloud theory" is true, wouldn't some oils (e.g., synthetics) form far less of a cloud, and therefore make the engine wear more?