What would be the best temp for my stat to open
180
192
195
I'm gonna replace mine but want to know the difference when they open
Thanks Dudes!!!

 

Since I didn't know myself i thought to look what others say. Here is a reply on a chevelle forum:
"There is not just one "best" temperature - it depends on how the engine was built and where you are measuring the coolant temperature: at the head or the intake manifold? For a street car you will experience the best oil life and engine longentivity when your coolant is 200 to 205 degrees. Oil life is shorter when the engine is run cooler because there needs to be a sufficient engine temperature to burn off the atmospheric contaminants that are attracted to oil - oil is hydroscopic. Max effort later model computerized fuel injected engine tuners shoot for lower temperatures (~ 160 to 170) because they are fighting the dreaded knock sensors that will pull out serious amounts of timing if they perceive any detonation (knock sensors are not perfect)."

By the way oil itself is not hygroscopic, but the additives make it tolerate water. Keep in mind that water is the combustion product that makes the engine go in form of steam.
For a daily driver I would choose 195 degrees.