I get a buzzing noise for 1-second (or less) on engine startup. Thought it might be coming from the power steering pump but I'm not yet sure. Perhaps it's the oil pump? Seems to happen more often on colder mornings (perhaps a pump is starving when the fluid gets cold/thick)?

Anyone else with a w210 have this problem?

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Neil
1997 E300D - naturally aspirated
280,000 miles (as of November 2015)