How long is it ok for an 80 to idle, especially in the winter time? The owner's manual suggests idling no longer than 20 minutes to avoid over heating the dual cats, flooding etc. In the past I have allowed other trucks (not 80s) to idle indefinitely with no consequences. I sometimes do this during the winter months during short stops as it is probably better than shutting the engine off and restarting two minutes later over and over again (just had to replace starter contacts) in sub-zero temperatures. I am considering a high-flow single cat system but what are the issues with the OEM exhaust and long idle periods? Does anyone have any experience with long idle times? Any mods necessary. I need my cruiser to be as reliable as possible in sub-zero, deep-snow back-country conditions.