My '85 300SD runs cold, it goes up to 60C in highway driving but the temp stays almost at the bottom during city driving. After driving it for an hour on the highway, the engine (excluding exhaust) is just warm, no problem touching head, and coolant is also just warm, is this cold driving harming the engine? Could it be that the thermostat is missing? Or should I not worry about this? Other than that, the car runs great, starts immediately, be it +15C or -15C
Thanks in advance, cp