I hope it's nothing....I would not drive it until it gets checked. You would have to plug on or screw in an external oil pressure gauge to start.

My experience with the same problem, my light was flashing on and off. I dropped the oil pan, was easy and I found little pieces of oil filter paper stuck in the oil pump. Awhile back someone made a filter..Bosch maybe? that had a mesh paper cover on the outside of the filter...the paper mesh was breaking off and ending up in the pan and pump. The prior owner used cheap filters and probably never changed his own oil.

The oil pumps are bullet proof but you never know hat the previous owner did.

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2002 X5 4.4i Sport Wheels
2014 X5 35i M Appearance & suspension package
1995 Porsche 993
1972 Porsche 914-6
2020 GLE 450 Twin Turbo
2019 Alfa Stelvio 500hp Quadrifogilo
Many motorcycles