My thought is the fluid is hydraulic fluid from the power steering pump. A blown high pressure steering hose is a known failure mode. Leaking power steering fluid would cause smoke on the exhaust manifold. If the power steering pump ran dry, it may have seized up causing the belt to be thrown and injured the fan. If your water pump failed and thrown a belt, you would have noticed a temperature rise and increased steering effort, but no fluid. Check your power steering fluid reservoir. Good luck

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2013 X5 3.5i M Sport
2004 M3 cabriolet SMG