Tried a fuel additive but seems to help a little from 5.5 to 4 after the cleanout run.

The test is stationairy, full throttle in neutral.
Normaly most diesels pass if in reasonable condition, mine is in better shape than that so it should not be a problem.

For the moment I stick to the timing being to advanced wich will couse more soot than normal, I'll check this weekend.

Peter