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Message: [QUOTE="TyCorr, post: 1013725, member: 1451"] Im not sure on all these details as the trucks had a 180 tstat for two years. I had a 192. Another 192. Then a 195 (which you have unless you didnt run the tstat I sent you) which I ordered from International for the IH waterpump. I purchased a 203° tstat and ran it from July 12 until September at which point we were stuck close to 100 degrees for two months and high oil temps were pissing me off. I was running mobil1 turbo diesel and my oci were about 4k miles. Its because with any kind of load I was cooking the oil out of the truck. Running 75 mph with 175/80s on 35s with 3.73s the engine heat was a little much. A 180 deg tstat kept my oil temps 220 or less. The point where apparently oil can live longer as my temps came down and I didnt need to change my oil every 2500 miles. I ran the truck like that for approximately the remainder of a calendae year and last fall I put a 195 in as my truck doesnt really do much these days. Pull a dump trailer. Probably 8-10k lbs total trailer weight but I use a towtune and it runs very cool. In fact that towtune flat to the floor on the climb to arlington with 18k lb of trailer never hit 1000° egt. Truck maintained 65mph too. Its something dumb like 40 or 60 hp tune, lol. My truck has never been maintained miserly. Its always been do what needs done but the tstat deal did NOT work out for me. It was obvious what it was as my motor had been out and gone through/replaced everything. Had my radiator serviced. New fan clutch. Nothing is worn or malfunctioning. I cang debate this anymore as Ive said my bit. My findings are in line with what Joe has said in other threads. With a 195 tstat, empty, I can get the oil to 200 degrees in any ambient temp. Maybe 210 if I flog it. Edit:I changed coolant and at the same time changed tstats which is why I changed the 180 after a year of service. If I was working the truck regularly, the 180 would have stayed in. No doubts. [/QUOTE]