I have an '01 S500 that is beating up the oil pretty bad. TBN drops to 1.9 in only 6k miles w/ M1 0W40. I suspect faulty crankcase ventilation, but my dealer said the car does not have a PCV valve, instead he said it has an air pump (?).

so I looked up "emissions control" parts on one of the OEM car part sites, and it lists an "A.I.R. pump" and an associated "check valve". is this analogous to a standard PCV valve?? if so, how do I inspect/change it? if not, how would I check/repair crankcase ventilation problems?

Thanks!