Increased EGTs

[thomas5853]

I just changed my oil & filter plus the fuel filters a couple of weeks ago. I used 5w-40 Rotella oil and put in 8 oz of prolong. I have been noticing EGTs about 20-40 degrees higher then normal when driving. Plus it is taking longer to reach my cooldown temp before shutting down the engine. Any ideas?

[CCdually6.0]

I realize this may be a dumb question, but have you been using your A/C more often since you noticed the increase? My EGT jumps above 400 at idle when the A/C is kicked on. A fast cool-down for me requires me to turn the A/C off. The EGT fall much faster.

[thomas5853]

I admit that I have noticed the difference when I am using the A/C. But I usually have my windows down. My idles stays around 400 when I am using the A/C also. I also use 2 stroke oil and diesel kleen at every fill up.