CM 871 oil Thermostat temp

[2dlb]

Hi All
im wondering if anyone knows 1.- of the part # for a cooler oil thermostat that is lower that the 235' stat that our CM871 calls for which is pt#4952629.
2. what is the best option for a ecm file based on ISX 450. 79291898 with a CPL 2732 and our current AV10069.13. From the forum i have found Rawzes notes and if im correct could we go with AV10181 or AV10234 as we have changed the DPF to the newer style. I did see that the AV 10183 was higher in torque down lower but as a fleet truck were trying to keep the operating range higher. As well were not in a position to demandate the truck and have to run legite is there a version of the MM that would be good in this or is that only for demandated engines
Thanks in Advance