T4 ABL Engine: Flashing Oil Pressure Light

I have a T4 van with an ABL engine (50 kW), manufactured in 2000, with 25,000 km on the odometer. Occasionally, the oil pressure warning light starts to blink. The light blinks for approximately 10 seconds and then turns off. The oil level is correct, and the engine runs normally. I use 5W40 oil.

Could someone identify the possible causes?

Best regards,

Motronic.