What does that mean? My car runs as well with "very little fuel left" as it does with a full tank.

I think I read that TBN = 2 is as low as you should go. Would be nice if the report indicated acceptable values of TBN. How high is TBN in fresh oil? Does synthetic have a higher TBN or does synthetic make TBN last longer, so to speak?

Also, what was the value of additional filtration in this case? Would the readings have been higher/worse running only the factory filter?

Sixto
93 300SD 3.0