Parts Catalog Accessories Catalog Tech Info Tech Forums
  Search our site:    
 Cart  | Project List | Order Status | Help    

Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 03-07-2000, 12:59 PM
Registered User
Join Date: Jul 1999
Location: Tampa, Florida, USA
Posts: 214
I know what the oil pressure is supposed to be: between 1 and 2 bars at idle, and immediately pegged at 3 at any engine speed over idle. Most of the time, my oil pressure is fine.

However, immediately after an extended high-speed drive (e.g. anything more than 30 minutes on the interstate), my oil pressure is lower than it should be by about half a bar. At idle, the needle is just barely over
the 1 mark, and it doesn't peg at 3 until higher RPMs are reached (I don't have a tach, so can't give exact RPMs). After a hard highway drive, in 4th gear (manual trans) it won't peg until about 50 mph. If I'm just driving around town, never getting on the interstate, the oil pressure is fine; after short trips on the interstate (my daily commute is about 10 minutes of interstate each way) it's also fine. However, the low pressure after a hard drive concerns me.

I'm using Castrol 20W50, which I've always used. It doesn't burn much oil, if any - I have to add about half a quart every 1000-1500 miles, but some of that is leakage from around the valve cover gasket, oil filler cap, and crankcase ventilation tube.

I'm guessing the oil pump has an impeller of some sort - is this prone to wear? For that matter, should I even worry about this issue since my oil pressure is fine *most* of the time? I hope to keep this car for another 250k miles as my daily driver, so I want the engine to last.

- Nathan
'83 240D, 250k miles

Reply With Quote
Old 03-07-2000, 05:39 PM
Posts: n/a

I'll be very interested to hear Benzmac's response to this. Before my 240D engine rattled and died at 516K miles, it was still pegging the guage on the highway.

Since it isn't using a lot of oil and is not going dangerously low at idle, it may not hurt anything, but I expect that Benzmac will shed some of his experience and wisdom on this.

BTW, I bought a ragged 240D with a decent engine, swapped the engine into my trusty old 240D, and I'm back driving it 190 miles a day. They can't be permanently killed by anything less than 18 Wheeler. If it's ever killed that way, I won't have to worry about it.

Good Luck,

Larry Bible
'84 Euro 240D, 516K miles
'88 300E 5 Speed
Over 800,000 miles in
Mercedes automobiles
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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Oil Change DIY Instructions Limited Edition Open Discussion 5 09-23-2007 10:56 AM
The oil debate again What do you think of this dpbrowne Diesel Discussion 101 04-01-2005 02:33 PM
Low engine oil pressure LEADFOOT Tech Help 30 11-19-2004 10:46 AM
Foreign and Domestic Oil no longer needed... moparmike Open Discussion 5 09-04-2003 08:13 PM
83 240D Leaky Oil Pressure Gauge Carrameow Diesel Discussion 1 11-19-2002 05:49 PM

All times are GMT -4. The time now is 02:32 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page