Hi guys, my mum just passed me her bmw e60 lci with a n52k engine (black cover) 1 year ago, and I have done 2 oil changes with ENOC full-syn oil 5w-30 with an OCI of 10k KM (roughly 6 months). The car has not been used much for the past 2 years before i started using the car.
Then on last week...