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 > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 08-07-2005, 03:41 PM
BrierS's Avatar
Registered User
 
Join Date: Jul 2003
Location: Charlestown, NH
Posts: 1,008
Recent Change in Oil Pressure Reading

Within the last 200+/- miles, I have noticed a change in the oil pressure readings (according to my gauge). My '87 300TD normally ran at 3 bars with the slightest of drop at lower RPMs. Now, it moves sooner to 2 and even drops slightly lower than that at times. I was running Mobil 1 5w30 until changing oil & filter this morning. This time I put Mobil 1 10W30 and found the same oil pressure readings as prior to the change. No oil consumption and I am changing at between 3-4,000 miles.

Any thoughts on what this may indicate? The engine has 136,000 miles.
Thanks
Steve
__________________
Steve
'87 300TD - 132K - Soon 4-Sale
'84 300D Turbo - 122K - Driving
'77 VW Type II - 77K - Restored
'08 250EX Ninja
English Bulldog (Brier) - My best friend. Passed away 12/02/04 while in my arms.
Reply With Quote
  #2  
Old 08-07-2005, 03:54 PM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Steve, why are you running 30 weight oil in the diesel?

Anything below 40 weight is not recommended. In fact, I'd venture to say that the 10W-30 oil is not rated for a diesel. Look on the side of the container. The Rotella is rated CH-4. I think that some of the better oils might have a CI rating.

Some of the fellows are running 15W-50, especially in the summer.

Can't tell you why the oil pressure is dropping, but, I sure hope it's not related to extensive use of 30 weight oil.

Sorry to tell you this, but, it's time for another oil change.
Reply With Quote
  #3  
Old 08-07-2005, 05:26 PM
Hatterasguy's Avatar
Zero
 
Join Date: Nov 2002
Location: Milford, CT
Posts: 19,306
Yeah why are you running 30 weight? It says right in the manual to run 40 or higher.

In the summer the oil pressure will drop lower, the oil gets hot.

I would consider your currant readings perfectly normal and your old readings not.

Dump the 10W-30 and get some 15w-50 or 5w-40 at least.
__________________
2017 Chevy Silverado 1500 LTZ
2007 Tiara 3200

"No free man shall ever be debarred the use of arms. The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government."
-Thomas Jefferson
Reply With Quote
  #4  
Old 08-07-2005, 05:36 PM
pawoSD's Avatar
Dieselsüchtiger
 
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,036
It varies on my SD practically each 10 degrees it is outside, I got off the freeway on a 90+ degree day a while ago and it was idling at right around 1 bar. After some slower in city driving it inched back up to around 1.5ish before I was home, in the colder months its always at 2 when idle.
__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 78k - mine - (OC-80,500)
'17 Metris(VITO!) - 8k - wifes (OC-10k)
'01 E320 Wagon - 159k - mine (OC-160,000)
'89 420SEL 166k - mine (OC-167,000)
'01 E320 - 171k - dad's (OC-171,500)
'07 E350 Wagon - 131k - dad's (OC-132,500)
'01 SL500 - 49k - dad's (OC-52,000)
'09 E350 4matic Sedan - 129k - Brothers (OC-128,000)
Reply With Quote
  #5  
Old 08-07-2005, 05:57 PM
Hatterasguy's Avatar
Zero
 
Join Date: Nov 2002
Location: Milford, CT
Posts: 19,306
Well the oil cooler has a t stat, as the oil gets warmer the t stat opens more and you will lose oil pressure.

Spec is .3 bar at hot idle and pegging at 3 bar by 3k rpm. As long as you are within specs MB says you are fine.
__________________
2017 Chevy Silverado 1500 LTZ
2007 Tiara 3200

"No free man shall ever be debarred the use of arms. The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government."
-Thomas Jefferson
Reply With Quote
  #6  
Old 08-07-2005, 05:59 PM
BrierS's Avatar
Registered User
 
Join Date: Jul 2003
Location: Charlestown, NH
Posts: 1,008
Brian . . . read your response and went out to the garage to see what I HAD been running. It was 15w50. Don't know what I was thinking when I bought the 30 this morning. Actually, I was thinking all of the gas jobs except my VW bus. I run 5W30 in them.

Time for my next oil change . . . with five miles on the last one. The nearly fresh syn should be good for lubricating my barn door hinges or something (better part of $50 . . . at 8.5 qts.) Cheaper than the alternative.

Thank you all for the wake-up call. The manual does say . . . the members have posted . . . I was asleep at my own switch.

As to the oil pressure readings, the present ones are more indicative of those I have read about on the forum. I had always wondered why the '87 was giving rather steady high readinds. Guess it is nothing to worry about.

Thanks.
Steve
__________________
Steve
'87 300TD - 132K - Soon 4-Sale
'84 300D Turbo - 122K - Driving
'77 VW Type II - 77K - Restored
'08 250EX Ninja
English Bulldog (Brier) - My best friend. Passed away 12/02/04 while in my arms.
Reply With Quote
  #7  
Old 08-07-2005, 06:02 PM
pawoSD's Avatar
Dieselsüchtiger
 
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,036
I've burned my hand on the oil cooler because of that T-stat. Even when idling around 1 bar super hot mine still pegs at 3 when I bring it to around 1,200 rpm Changing those (what I thought were metal ) o-rings on the filter cover made a very slight improvement, still need to change those on the 83....
__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 78k - mine - (OC-80,500)
'17 Metris(VITO!) - 8k - wifes (OC-10k)
'01 E320 Wagon - 159k - mine (OC-160,000)
'89 420SEL 166k - mine (OC-167,000)
'01 E320 - 171k - dad's (OC-171,500)
'07 E350 Wagon - 131k - dad's (OC-132,500)
'01 SL500 - 49k - dad's (OC-52,000)
'09 E350 4matic Sedan - 129k - Brothers (OC-128,000)
Reply With Quote
  #8  
Old 08-07-2005, 06:10 PM
Registered User
 
Join Date: Sep 2001
Location: central Texas
Posts: 17,277
Guys, Do yalls statements apply to a 1985 617 turbo , for instance ?
Reply With Quote
  #9  
Old 08-07-2005, 06:11 PM
Registered User
 
Join Date: May 2005
Location: Dodge county GA
Posts: 72
would a heaver oil help consumption?
__________________
http://www.fairtax.org
Reply With Quote
  #10  
Old 08-07-2005, 06:18 PM
Registered User
 
Join Date: Sep 2001
Location: central Texas
Posts: 17,277
I run straight 40wt Delo 400 ( which is ok'd by the literature for places which remain over 86 degrees F )... because I have always increased the viscosity on engines with high mileage... due partly to a need to fill the increasing clearances in the bearings...
Some of the blanket statements at the first of this post.... or the blanket implications... don't really fit what the literature specifies....particularly since he is in NH....
Reply With Quote
  #11  
Old 08-07-2005, 06:47 PM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 34,237
generally

i think most would agree that if an engine is worn heavier oil would help. but not heavier than what is recommended by the mfgr. just go to the top of the range.

tom w
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
Reply With Quote
  #12  
Old 08-07-2005, 08:43 PM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Quote:
Originally Posted by BrierS
Time for my next oil change . . . with five miles on the last one. The nearly fresh syn should be good for lubricating my barn door hinges or something (better part of $50 . . . at 8.5 qts.) Cheaper than the alternative.

Thank you all for the wake-up call. The manual does say . . . the members have posted . . . I was asleep at my own switch.
Steve, with only five miles on that oil, I'll bet you could use it in one of the gassers without a problem. Of course, it looks black, but the amount of soot is minimal, overall, and the gasser would not have a problem with it.

Anytime.

Help is what we do here.
Reply With Quote
  #13  
Old 08-07-2005, 11:33 PM
aklim's Avatar
Registered User
 
Join Date: Apr 2000
Location: Location: Greenfield WI, USA
Posts: 8,514
How sure is anyone that the pressure sensor is not at fault? I had the same thing happen and it came to the point that at idle, I had 0 psi. Replaced the sensor and the pressure came up immediately
__________________
01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow
Reply With Quote
  #14  
Old 08-08-2005, 12:32 AM
Gurkha's Avatar
Satyameva Jayate Ad vitam
 
Join Date: Jun 2003
Location: Boondocks
Posts: 1,026
Absolutely right about the pressure sensor, I don't have a oil pressure gauge, recently when I switched from Delvac Super to Delo 400, my oil temp light started coming on at idle, I panicked thinking that Delo 400 was thinning out at 45c weather, turns out, it was a faulty pressure sensor switch, same goes for temperature sensor switch, these things break and send faulty readings sending owners into a panic.

Changed my pressure sensor and now everything is fine, Delo 400 actually outperforms Delvac Super in my vehicle in terms of MPG and consumption.
__________________
99 Gurkha with OM616 IDI turbo

2015 Gurkha with OM616 DI turbo

2014 Rexton W with OM612 VGT
Reply With Quote
  #15  
Old 08-08-2005, 01:00 AM
pawoSD's Avatar
Dieselsüchtiger
 
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,036
I actually suspect that too, mine freaked out a little while ago when I was coming to a stop, it went erratic between 0 and 1 bar very quickly for about 2 seconds then went to 1.5 and stayed there like normal.....never happened again since.....I was about to shut the engine down as soon as I saw it move! (paranoia-trained reflexes)
__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 78k - mine - (OC-80,500)
'17 Metris(VITO!) - 8k - wifes (OC-10k)
'01 E320 Wagon - 159k - mine (OC-160,000)
'89 420SEL 166k - mine (OC-167,000)
'01 E320 - 171k - dad's (OC-171,500)
'07 E350 Wagon - 131k - dad's (OC-132,500)
'01 SL500 - 49k - dad's (OC-52,000)
'09 E350 4matic Sedan - 129k - Brothers (OC-128,000)
Reply With Quote
Reply

Bookmarks

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
Oil Change - Woman versus Man Fisherman Diesel Discussion 33 10-09-2006 08:57 AM
HELP... oil pressure gauge still at 0 ! Joseph_H Tech Help 9 01-20-2003 05:31 PM
Any fanatics religiously change oil @ 2.5K intervals or less? -fad Tech Help 60 03-19-2002 11:22 AM
Oil change aantonic Tech Help 6 08-24-2001 11:10 PM
oil change Mike Michalek Tech Help 12 01-06-2001 07:04 PM



All times are GMT -4. The time now is 02:14 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, 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