Collected my new (to me) E270 yesterday and was surprised how low the temp gauge was. The outside temp was about 14c but the engine temp gauge struggled to get above 80 on the 200 mile drive home. It was warm and sunny and for 1 1/2 hours on the M6 it was stop go. Later I took an hours rest and for the second half of the journey, after dark, the temp gauge was between 50 and 60. Is this normal?