.3 bar is .3 bar. It would be hard to read on the guage but with a mechanical one hooked up it shouldn't be a problem.

Thats what MB specs for the min oil pressure for hot idle. Most of these cars seem to be between 1-2 bar, depending on how tight the engines are and how accurite a 20 year old guage is.

Change the oil and don't worry about it.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200