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  #1  
Old 07-12-2006, 03:09 AM
ayrtonsenna's Avatar
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low oil pressure at idle

well today i changed the oil and i noticed that the car's oil pressure gauge still falls to '2' when stopped at a stoplight or similar situation. it goes right back to '3' when the accelerator is hit. it was doing this before the change too. i checked the levels - fine. is this normal or should i be doing something differently?

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  #2  
Old 07-12-2006, 06:24 AM
t walgamuth's Avatar
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at idle i believe the manual says anything down to 1/2 is normal. you are fine. a good engine will go down to about 1.5 at idle when good and hot. so you are very good.

tom w
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  #3  
Old 07-12-2006, 03:42 PM
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Mines been down at about .9 to 1.1 bar when its hot (at idle) and close to 2 when its cooler outside and I'm not driving it hard, I am going to replace the little rubber o-rings on the oil filter cover stem when I have it out in week or two....they were pretty hard last time, its probably time.
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  #4  
Old 07-12-2006, 07:49 PM
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O Rings

I gotta ask. What little rubber O rings on a shaft are you referring to? Are these around the shaft that goes inside the filter all the way down the center? and if so are 240D's supposed to have any on this shaft? I did my first ever oil change a few weeks back and there were no such o-rings in sight.

- Peter.
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Formerly...
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1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021
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1984 123 200
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1972 Cadillac Sedan DeVille
1971 108 280S
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  #5  
Old 07-12-2006, 11:36 PM
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Yes, the 240D has them and they need to be replaced every couple of years anyway. You might have old ones on yours and not have realized that they were rubber because they were so petrified.

Len
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  #6  
Old 07-13-2006, 12:01 AM
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Yeah in my observations it seems good to replace them every 3-4 oil changes as by the 3rd they're getting hard, and by the 4th, they're rock hard/need replacement. Since they are only like .33 cents apiece, its not that big of a deal.
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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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  #7  
Old 07-13-2006, 12:25 AM
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I would say so. I would not worry about "2" at idle. Especially considering that my car is at "0", yes ZERO, when it is at hot idle (above 100°C) when in drive. When in park at hot idle, it is around "1". It is back up to "3" when I accelerate, but not until 1800 RPMS. My owners manual says that ".3" is OK at hot idle. My car is just a old work car though, with 266K. I do not care... I will drive it until it stops. Still does not use (or leak) any oil between oil changes. I am amazed. Perhaps the oil sender is on the fritz.

Quote:
Originally Posted by t walgamuth
at idle i believe the manual says anything down to 1/2 is normal. you are fine. a good engine will go down to about 1.5 at idle when good and hot. so you are very good.

tom w
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  #8  
Old 07-13-2006, 12:46 AM
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Is this while in "PARK/NEUTRAL" or in "DRIVE/REVERSE"?
Thanks Tom.....

Quote:
Originally Posted by t walgamuth
at idle i believe the manual says anything down to 1/2 is normal. you are fine. a good engine will go down to about 1.5 at idle when good and hot. so you are very good.

tom w
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  #9  
Old 07-13-2006, 12:59 AM
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Mine pegs at three until it gets warm, then drops down to two. When its been running for half an hour or so, or its really hot outside, then it drops down to 1.5.
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  #10  
Old 07-13-2006, 01:01 AM
ForcedInduction
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1-2bar with hot oil is normal for me.
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  #11  
Old 07-13-2006, 01:04 AM
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Quote:
Originally Posted by sokoloff
Yes, the 240D has them and they need to be replaced every couple of years anyway. You might have old ones on yours and not have realized that they were rubber because they were so petrified.

Len
Unless I'm blind or really ignorant mine definately doesnt have them on there at all. I'll look really closely again wen I do my next oil change in about 280 miles. If they are really not there I'll have to put new ones on. Does not haveing them do any harm?

- Peter.
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2021 Chevrolet Spark
Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles.
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S
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  #12  
Old 07-13-2006, 02:41 AM
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Quote:
Originally Posted by pawoSD
Since they are only like .33 cents apiece, its not that big of a deal.

Yeah as long as you dont get them from a MBZ dealer.....$3.24 each!!!!! Yikes!

But do change them. If oil is getting past them then it is just dumping back down into the oil pan.
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  #13  
Old 07-13-2006, 02:42 AM
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Quote:
Originally Posted by pj67coll
Does not haveing them do any harm?
- Peter.
I suspect it would cause some of the oil to bypass the filter.

Jeremy
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  #14  
Old 07-13-2006, 12:16 PM
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can you use 'regular' o-rings?

I have a box of assorted O Rings I used to fix the A/C in the Mercedes (and several other cars on the block since they saw me working on it).

Can those Orings do? Or is it a special high temp deal?

Thanks!
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  #15  
Old 07-13-2006, 12:20 PM
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Quote:
Originally Posted by redassag00
can you use 'regular' o-rings?

I have a box of assorted O Rings I used to fix the A/C in the Mercedes (and several other cars on the block since they saw me working on it).

Can those Orings do? Or is it a special high temp deal?

Thanks!
I was just about to post this as I'd like to do the same if the a/c o-rings will work. I'm getting ready for a major overhaul and I'll have some o-rings left over.

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1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo
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