The steering makes noise when first starting like a moaing noise is it low power steering fluid
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2003 Mercedes-Benz ML320 Question: Noise
Answer #1patrick mannion from Greg Solow's Engine Room, December 11, 2009, 10:48Master
Groaning sound when turning the steering is usually a sign of low power steering fluid. The system should not loose fluid unless there is a leak from the steering pump, steering rack, or pressure hoses. If the fluid level is OK perhaps try flushing the power steering fluid, install new fluid and perhaps see if a product called Lubegaurd is comaptable with Mercedes fluid. Lubegaurd is a great steering fluid additive for many other cars.