Put Some Amsoil In The Old Girl And A Few Questions
 

ok so the truck is running great quieter, better mileage, but is it possible to have to good of lubercation....? my engine temp will now never get over 160 in 80 degree weather it barely hit 180 at highway speeds and hitting 140 is barely possible in the now 30 degree weather (went from kansas to wtoming), the lower temp is an obvious indication of better lubercation and a lack of friction the engine cooling worked perfect before and all that changed was the oil this may not seem like a huge problem but a colder engine will not run as efecantly as a warmer one the fuel atomization will not be the same along with the engine running in open loop all the time (and i want the heater to work faster!), I was wondering if any one else has had this happen i put 2 large pizza hut boxes in front of the radiator to see if this would help but have yet to drive it with this new "modification". and i was wondering if this is a actual problem or me being parinoid...?

Um, sounds like your thermostat is stuck open. Try replacing it.

i have had the same problem, drove 20 miles+ just to almost reach 160. changed my thermostat. and bam as good as new

I would also guess T-stat. I went through something like that too. But mine would be fine sometimes and other times would not warm up at all. It's a pretty cheap fix or (try) either way.

ot just nice preventative maintenence

I agree with everyone above... You need to change your thermostat and drain and flush your coolant system too...