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Message: [QUOTE="TARM, post: 1012773, member: 578"] If they stay in that range you are 110% correct your oil cooler is working as it should. That is why I was very careful about being sure to state this one part. Hey I can understand if this is just going round and round for no good reason so if you want to be done with it I completely understand. But I am sort of interested in what could be allowing your cooling system to not keep up. As your temps are staying within the 20degree spread that means the oil cooler is properly working and offloading the heat to the coolant. For some reason though your coolant side of the system is not able to keep up. Did you have this issue with the 195 and then went to the 180 or did you try the 203 and this happened? Reason I am wondering if say it was a 195 did you try another one at the same temp and get the same issues or did you just go to the 180? I am thinking maybe a Tstat not working properly anymore. Maybe not opening all the way or even properly? Just curious but you mentioned the oil cooler was clogged before you rebuilt it. Was it both the oil and coolant side or just one or the other that was clogged? What temps does your coolant and oil say at now with the 180, cruising and then again with that 10K trailer? Yes I can without a doubt feel the difference with oil. Much in the same way you can when its dead cold and of course when its past due for a oil change. In some ways its a nice thing with these motors in terms of oil changes in that if you are in tune with how the engine runs you can tell when that oil is starting to lose its viscosity. And do not worry about the extra questions if you do not care to look into this further. I just find it of interest but I do not expect you to. LOL [/QUOTE]