Optimium engine temp?

[ubtripn]

Yes there is, all engines have a correct operating temperature. Your local auto parts store should be able to tell you what came stock in your truck. Too cool is bad for power, mileage, will lead to acidic build up in your oil and shorter engine life. There is a reason the engineers spent all that time figuring out what operating temperature is best for your motor.

I agree with this. Temperature and friction control has always been en engineering imperative regarding efficiency and wear. Friction vary dtermined by temp, that alone suports the above statement. With todays's vehicles it applies even more withe various sensors making sure to keep it exact. On my Nissan the temp gauge sat in the middle for so long I just thought it was broke but one day after years of driving my coolant, "wore out" or broke down molecularly and the needle rose.