2013 CRD Diesel in Sump
 

Hi all. Got a 2013 Voyager with the VM 2.8 CRD. Recently the oil level in the sump has been going up. It keeps complaining about needing an oil change due to degradation.
il was last changed 3 months ago and it was way up the dipstick. Drained about 10 litres out and it smells very diesely.

I know very little about these engines, so any ideas how this is happening