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!

The air-injection system has NOTHING to do with crankcase ventilation at all.

PCV is done thru orifices & hoses at the valve covers.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

thanks MBDoc.

have you ever seen crankcase ventilation issues with the 5.0L? is it a simple task to remove those hoses and clean 'em out?

you can view the latest oil report for this car (along with "arm chair expert" comments) at...
http://theoildrop.server101.com/forums/showflat.php?Cat=0&Number=818519&an=0&page=0#Post818519