Above is an Oil filter removed from a 5 Series diesel. The most clogged filter any of us have ever seen. It’s a miracle the engine hadn’t seized. We flushed the oil a few times using Forte Motor Flush and managed to get the cleanliness of the engine back to where it should be.
It’s testament to BMW that the engine had managed to keep running and testament to Forte that their motor flush managed to clean the engine out!