Odd experience the other day… spent 20mins crawling up a steep hill due to a traffic jam, outside temperature was warm / sunny so I kept an eye on the temp gauge (out of boredom tbh) and noticed that the gauge reading dropped down to around 70 degs when stationary and back up to 90 degs when I moved off again. Very visible movement on the needle each time I stopped / restarted.
Only other thing I’ve noticed is the car has used some oil (probable 0.5 ltr in the last 5000 miles). No mayo under the oil filler cap and coolant levels fine / clear pink colour.
Any thoughts on what’s going on? I’ve never had this happen on a car I’ve owned before. Dodgy thermostat perhaps? Amazingly efficient cooling system? I do have an r-tech turbo heat shield fitted plus Revo intake & TOP but I can’t see these making much of a difference.