Oil and filter changed, put there little less to have space when dpf does regen which was indeed in fault. Fuel was mixing with oil but it never got hot enough to burn it off as i was doing quite few short journeys lately and not so much long one's. Also checked codes and apart from some old ones there was no issue related to DPF. Advice was drive it at least once in 2 weeks on motorway for like 40 mins so it can do its thing. Also apparently regen is not always obvious (start/stop disabled, louder engine, fan on, etc,...) sometimes you dont even know about it which is news to me. Either way thought i will post update just in case anybody else have a same problem in future as it will be probably common issue.
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