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2004 to 2008 F-150 and Mark-LT
4.2L, 4.6L and 5.4L equipped F-150s and Mark-LTs.


 
 
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Old Tue, September 21st, 2010, 10:11 AM
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Quote:
Originally Posted by Longshot270 View Post
Not all trucks have the fans click on at 190. Most people see 195 but I know that Jack's truck runs at 205 regularly. Slightly warmer temperatures will help combustion efficiency but oil starts breaking down around 250. I would not try increasing the temperature above 210.
I was referring to the water thermostat, not the fan. But I get what your saying. What would you guys say is the "optimal" running temp????
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