Not to start any arguments or anything, but how, or what determines "efficient operating temp."? I've been using a 160* stat for over 40 years, with no adverse effects on the engine or oil. Why should I change if what I have works for me?
I have to agree with the 160 philosophy... A stat does not regulate operating temperatures.. it only regulates when the water starts to circulate..
I run a 160 stat as I want my engine to run as cool as possible when racing.. but when driving on the street, the temp gauge will always sit at 180-ish..
