09-19-2015, 02:50 AM
(09-19-2015, 02:05 AM)kmoney_imp Wrote: Yeah. I've never shut off for traffic lights, but temporary construction delays on highways or clearing accidents on bridges etc... anything over 4 or 5 mins and looking to be longer sure.
My fear wouldn't be so much about getting in rear ended, as traffic has long backed up by this point, but losing all my oil flown as soon as I kill the engine. I get that you are also killing the biggest heat generator (combustion itself) but you are also effectively losing all your oil related cooling to the engine's hotspots.
Idling versus sitting dead, hot.
The oil contributes to cooling...WHILE MOVING. Stationary and idling, it just gets hotter.
Shutting down, the engine generates no heat. The inner hotter areas radiate to the external surfaces...but that's more an equalization of temperatures than it is, it getting hotter. It's a valid concern but it doesn't seem to me as if the momentarily higher temperatures inside the valve train, are going to be worse than the ever-rising temperatures of a long idle standing still.