Original post by: Igor ,
180 degrees thermostat on isx engine
Is it good idea to change from a 190 to 180 degrees thermostat on 07 isx engine. Would that hurt my fuel economy. Not really used to these newer engines, but it makes me nervous cause sometimes when puling big hills in hot weather coolant goes up to 220 degrees and oil to 240. Is that normal for these engines? I know they suppose to run hotter. Isx built in late 2006 pre dpf.