Engine will run hotter when newer. The tighter factory tollerances mean more heat and friction. My C with 20,000 miles runs 199-204 on highway with Mobil 1. After I switched to the synthetic (at 1500 miles) the temp dropped 1-3 degrees on average. In traffic or idling for awhile my temp will get into the 220 rang,e but never in the 230's.
Temp readings...
Can anyone tell me what's the normal operating temp should be at? I checked my EVIC and it reads slighty over 225 and high as 233+? This is on a 75* degree day.And no, i don't mash on the throttle nor race this car! Also, when i look at the gauge needle (when car is fully warmed up) , it actually sit's above the middle mark just a bit? 
Has anyone actually checked there temp reading in the EVIC mode, and/or experience the car overheating on them?
Has anyone actually checked there temp reading in the EVIC mode, and/or experience the car overheating on them? 
