Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help

Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 09-16-2001, 06:40 PM
Registered User
Join Date: Sep 2001
Location: Palm Springs, CA
Posts: 34
Question Low Oil Pressure 79 450SEL?

Does anyone know if it is abnormal for the oil pressure to drop to 5-10 psi when engine is idling and hot (first line on pressure gauge is 15). I suspect the oil pump is worn, but before spending the $300 to replace it, I was hoping for some insight. I know that some reduced pressure when idling is normal. When I speed up the engine, the pressure does not build all the way up to the peg at 45 psi until I get to about 2000 rpm. Even when I am driving, at betweem 35 and 40 mph in top gear the oil pressure is only about 30 psi (below 2000 rpm). At all other speeds it is up to 45 at least. I have driven lots of Benzes and I have never seen this before, so I think there is a problem. Using 15W50 Mobil 1.

Reply With Quote
Old 09-16-2001, 10:11 PM
Registered User
Join Date: Sep 2001
Location: Palm Springs, CA
Posts: 34
forgot to mention -

car has 130k miles
Reply With Quote
Old 09-17-2001, 12:43 AM
MikeTangas's Avatar
Senior Member
Join Date: Apr 2000
Location: So. Cal
Posts: 4,430
Sounds like it is still within spec, .7 bar as an acceptable low oil pressure. It should peg out a little earlier though.

Have you checked the pressure with a different gauge? Maybe the gauge is failing. When was the last oil change?

Check out the little stuff first.

Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon least its a diesel

Non illegitemae carborundum.
Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Low engine oil pressure LEADFOOT Tech Help 30 11-19-2004 10:46 AM
Low oil pressure reading hot JDUB Tech Help 1 03-08-2003 02:18 AM
W124 oil pressure sender questions (yeah, I did the search) G-Benz Tech Help 5 03-07-2003 04:36 PM
Oil pressure at 1 bar too low? bobterry99 Tech Help 6 10-10-2002 01:53 PM
Low Oil Pressure???? mark300d Tech Help 5 05-16-2000 08:44 AM

All times are GMT -4. The time now is 12:45 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page