low oil pressure S50
 

My 1999 W140 oil pressure seems to continually get less as the days go on. It sets at 1 when idleing, 2 at cruise. I changed the oil and replaced the plugs just last week. The oil level has not changed and I see no oil leaks except a minor sepage around the gasket. I noticed that two of the old plugs- one from each side had oil on them. I am right at 190K..what should I be expecting to repair?

Low oil pressure is usually indicative of worn bearings on the crank. BUT it could also be a weak oil pressure sender unit.

http://www.peachparts.com/shopforum/tech-help/156035-e420-oil-tubes-gone-78k.html?highlight=oil+tubes

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=23I0RAMEE23Z1816VK&year=1999&make=MB&model=S-500-003&category=A&part=Cam+Oil+Line+Fitting