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  #1  
Old 09-06-2005, 11:38 PM
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Oil Pressure Normal??

Hello All, I am a newbie, and was wondering if the following is normal in reference to a 1984 300D T, 142K miles. When I first start the car the oil pressure is all the way up then after driving down my street, I stop at the stop sign, it's almost below the "1" driving at slow speeds(15-20MPH) it sits around "2" only when full acceleration or crusing speed is it at "3". Any Info Thanks, This site is great for new MB enthusists.
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  #2  
Old 09-06-2005, 11:53 PM
t walgamuth's Avatar
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i believe you

will find that that is within normal range. check you r owners manual.

what kind and weight of oil are u using? also how many miles on this batch?

tom w
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[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.
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  #3  
Old 09-07-2005, 12:01 AM
Craig
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Although the pressure is probably within the normal range per the manual, it seems a bit low to me. Mine never gets below 1.5 bars at idle and goes to 3 bars between 1000 and 1500 rpm. I would make a note of the pressure before and after the next oil/filter change to see if it makes a difference. There is lots of info in this forum regarding the best oil and filter brands to use.
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  #4  
Old 09-07-2005, 01:59 AM
makin' a mutt
 
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on a related note...

My oil pressure stays pegged at 3 bar any time I've got my foot on the accelerator. At idle, it's about 1.5-1.6, and the needle twitches a little. Is the twitchy needle at idle normal, or indicative of something catastrophic about to happen? The twitch is really only about a 0.01 movement, but it's still noticeable...
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  #5  
Old 09-07-2005, 02:33 AM
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The twitching can be caused by an electrical signal minor issue, an oil pressure sensor thats a little worn out, or it could be the thermostat in the oil filter housing adjusting the flow to the oil cooler teeny bits back and forth, its all normal. Sometimes mine will fall to 1.3 bar after I've come to a stop, then it bounces up to 2bar then back to 1.3ish then back to 2 again....this is just the oil thermostat opening and closing and thus the flow/temperature changes. Its all very interesting....
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  #6  
Old 09-07-2005, 02:44 AM
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My oil pressure will sit right below the 2 BAR mark when fully warmed up... i have seen others' cars and usually their's is around 1.5 warmed up, what does this implicate?
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  #7  
Old 09-07-2005, 06:07 AM
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i would think that is normal. .my car usually pegs at 3 when at wot.. and happily idles around 1.75 after a minor wot run.. if i run it at wot at a long period.. it would idle above 1, then a couple of minutes after it would go up.... on regular trips it sits happily at around 2 at idle...

oil used. Catrol CRD Plus SAE40
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1975 200 - Sold (no pix);
1978 200 - Sold - http://www.pbase.com/hboy/redbaron
1979 300TD - Sold
http://www.pbase.com/hboy/greenwagon
http://www.geocities.com/hboy726/300TD.html
1985 230E - now my daily driver...
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  #8  
Old 09-07-2005, 06:35 AM
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Quote:
Originally Posted by PC300D
When I first start the car the oil pressure is all the way up then after driving down my street, I stop at the stop sign, it's almost below the "1" driving at slow speeds(15-20MPH) it sits around "2" only when full acceleration or crusing speed is it at "3". Any Info Thanks, This site is great for new MB enthusists.
I think that's normal. Or, more accurately, if you're saying what I think your saying, its normal. Per the manual you should have at least .3 bar at idle, most people have 1.5 or so. You should peg the dial on acceleration, and it sounds like you do. The concern I have is the last thing you wrote. When you say crusing speed, I assume you mean anything over 30 mph or so. You should not have to drive 60 mph to peg your gauge.

Type of oil can make a difference. With Chevron Delo (a dino oil) my gauge behaves similar to yours. With Mobil 1 15w-50 (a synthetic oil) my dial never dropped below 2.
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  #9  
Old 09-07-2005, 07:48 AM
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Thanks everyone, I also wonder about the oil and filter, I was going to try some mobil 1 but heard conflicting reports about seals leaking after mobil 1 use, could just be one guy's experience or a rumor. Thanks again for the info.
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  #10  
Old 09-07-2005, 09:12 AM
t walgamuth's Avatar
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you never

shared what oil you are using, but generally heavier oil will result in higher oil pressures. on a worn engine, which yours may be, i always err on the side of using the heaviest oil that the manual allows for my temp conditions.

tom w
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[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.
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  #11  
Old 09-08-2005, 11:21 PM
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3 Normal

i just got the 240d 82 running that was abandoned for 3 yrs. when starting up the oils at 3 and pretty much stays there. 2.5-3 generally, is this bad? changed oil put in 40weight
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  #12  
Old 09-08-2005, 11:29 PM
t walgamuth's Avatar
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pressure sounds

really good. no worries.

is the 40 w diesel rated?

tom w
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[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.
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  #13  
Old 09-09-2005, 12:46 AM
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don't know

i don't know how do i tell, never had a diesel before.
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  #14  
Old 09-09-2005, 03:53 AM
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Brick right foot..
 
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Quote:
Originally Posted by tjohn
I think The concern I have is the last thing you wrote. When you say crusing speed, I assume you mean anything over 30 mph or so. You should not have to drive 60 mph to peg your gauge.

you are quite right.. i checked last night.. i'm only travelling at 30KPH and it is already at 3bar....
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Mike

----------------------------------
1975 200 - Sold (no pix);
1978 200 - Sold - http://www.pbase.com/hboy/redbaron
1979 300TD - Sold
http://www.pbase.com/hboy/greenwagon
http://www.geocities.com/hboy726/300TD.html
1985 230E - now my daily driver...
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  #15  
Old 09-09-2005, 06:35 AM
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Quote:
Originally Posted by pawoSD
The twitching can be caused by an electrical signal minor issue, an oil pressure sensor thats a little worn out, ...
His car uses a mechanical pressure gauge, not an electric like the W126.
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