Mini One Diesel Oil Pressure Issue

Oil pressure warning lights on your Mini One, especially with that mileage, could be serious. When was the last oil change? Have you checked the oil level? It sounds like you might have a blocked oil filter restricting oil flow.

The oil change was definitely overdue. I didn't think it could cause such problems. Could a blocked oil filter really cause the oil pressure to drop that much?

Yes, a blocked oil filter can definitely cause low oil pressure. The oil pump can't draw enough oil through a clogged filter. I had a similar issue. If the oil change is very overdue, the oil itself might be sludged up too. Best get it checked by a mechanic, as prolonged low oil pressure can wreck your engine.

Thanks for your help. It turned out you were right. I took it to a workshop, and they confirmed oil contamination due to an exceeded maintenance interval. An oil change and new oil filter later, and the oil pressure warning lamp is gone. The total cost was 165€