That's your engine coolant temp gauge; sitting at a normal level, at least here in the UK with a likely similar climate/temperature, i.e. not the Arctic or a desert! The engine oil temp can be dialled up in the top display in the centre of the dashboard, in the clock. fuel consumption, boost etc settings. Oil temp on my '17 1.6DiT when hot the oil temp fluctuates around 90C when fully warmed up.