I had the same problem with my former 190D (I know that this is a not accelerating car, but once lowered enough and on speed, the turns can be taken very hard) and changed the oil-level sensor which was sufficient to solve the problem...
It is nothing to be worried about.

greetingz,

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1990 300SL-24
1993 C250D with a minor 600+k kilometer
www.MBenzNL.com(the Netherlands)