Brought my series 3 for a good spin this evening ( nice weather and all that!) and got home turned it off and then a pretty major leak started from directly under engine it has since stopped, it seemed like water then I saw a slight colour in it so I'm guessing its coolant? It's first time it's had a good drive in a while and I was going about 60mph on the run so maybe I opened up Pandora's box! Also I noticed when I turned it off there was a lot of rattling and vibration before it actually stopped. Any ideas ??