On grades I drive by egt's and keep eye on all temps. Mine is Cummins and i dont go over 1200 on egt's. Not sure about cat. Dont forget to also cool down turbo before shut off. And dont stop at top once you make the top, keep going to cool stuff down. Things should work as designed. If overheats something not right. I think vantage hill is worse going west bound with headwind. Good shop in Quincy, doesn't take advantage of freeway traffic. I fuel at mile marker 101 Ellensberg I think. Vantage...not much and middle of nowhere, so to speak. You got cell service though.
