It depends on whether you get the VDO(oem) unit $70+
or the HamburgTech aftermarket unit $30+.
The owner's manual says 0.3 bar is Acceptable at idle.Unfortunately,my car ' oil pressure drops to zero at hot idle,(but peaks at 3 bar during hwy)This I was advised by a MB mechanic to leave alone and do nothing for 1 year so far.
I've got the Hamburgtech unit but have not bothered to install it yet.
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Tom 2010 C250 4-matic Sport (Canada)
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