Was driving my Mercedes E350 diesel earlier and started to hear the engine very noisy and car began to loose power, was driving up a steep hill at the time. Stopped the car and lifted the bonnet. There was ALOT of heat. Checked coolant levels and they were ok, but oil levels just below minimum!!! So red faced I called my husband to get engine oil. I am wondering if I might have done much damage, I didn't drive it for long when I heard the noise but still!! Is it possible that I might have got away with it assuming this is the problem???