Hello ! On my Essi, Mk 6, Bj 94, Td 90ps, 180tkm run, always flashes on exactly 3000 tours the indicator light for oil. The last oil + oil filter change is under 1000 km ago. The oil stand is perfect. Mostly it flashes only in idle, at the traffic light or when I switch down, on 3000 tours, otherwise NEVER. What could it mean and how can I fix it ? Many greetings, Schleifgeraet