Correct Thermostat Temp

[OggyOggy]

I'm at 72000 miles and have noticed my thermostat not opening and cooling until 206ish F when it used to clearly open at 200. This is just driving around and not working the engine very hard at all. In looking for a replacement I've noticed thermostats at 180, 190, and 200F. Which is the correct one for my 2012 Ram Longhorn 6.7 4x4 CTD SRW? I think it's 200 but don't just want to guess.
Thanks,
Joel

 

[NIsaacs]

https://www.genosgarage.com/product/gates-thermostat-34212/thermostat

 

[EDankievitch]

My 2012 ran way hotter than every other truck I have owned before or since. I believe it had a 200 degree thermostat in it. My 2013 has a much cooler one in it. First time I noticed how much cooler was the first cold winter. The heat output from the cab heater is lower noticeably lower. The 13 runs around 190-195 where the 12 ran at 200-208

 

[OggyOggy]

https://www.genosgarage.com/product/gates-thermostat-34212/thermostat

Been there, but if you list all the thermostats you'll find multiple temps with notation that they'll fit various years. I've since learned that the 10-12 6.7 engine with the DPF is the reason for the higher temp. Those with DEF and before take a lower temp.

 

[Cummins12V98]

My 11 HO ran around 201.