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  #1  
Old 02-22-2008, 05:06 PM
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w124 oil presure gauge. Noraml to hit 3 bar?

Ive never seen a pressure gauge move like this car! It's consistently pegged at 3 bar on acceleration (even average acceleration). Is this normal?
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  #2  
Old 02-22-2008, 05:12 PM
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3 bar = 45 psi ...... not really that much pressure. My truck runs 35 ish at idle and up to 80 at WOT. I am not sure why they put the limits of the gauge so low.
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Old 02-22-2008, 05:13 PM
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oh, but yes 3 bar is normal for that car. a better measure is how fast does it build when you start it.
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  #4  
Old 02-22-2008, 05:24 PM
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Quote:
Originally Posted by TTCummins View Post
oh, but yes 3 bar is normal for that car. a better measure is how fast does it build when you start it.
on start up it seems normal, middle of the gauge, but just a little throttle really pumps up the pressure. Diesels are new, and strange
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  #5  
Old 02-22-2008, 05:38 PM
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Mine is a 92 300D 2.5L I5 and does the same thing. At idle its around 2. As soon as I accelerate its at 3.

According to the owners manual:

" OIL PRESSURE GAUGE The oil pressure at idle speed may drop to 4.4 psi (0.3 bar) if the engine is at operating temperature. This will not jeopardize its operational reliability. Pressure must, however, rise immediately upon acceleration. "
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Old 02-22-2008, 06:08 PM
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Usualy the hot idle is somewhere between 1-2 bar, and it should rise to 3 when its off idle. On the turbo charged engines it needs to be their by 3k rpm at the latest because of the oil coolers in the pistons.

My friends S320 has a constently pegged guage as well, I did a bit of research and supposibly their is a short somewhere. Thats what I'd suspect in your case.
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Old 02-22-2008, 06:27 PM
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I've heard that when the oil pressure senders in these cars fail, the gauge constantly reads 3 bar. You might be able to test by looking at the gauge while pre-glowing. If the gauge reads 3 with the engine off but the key in the run position, your sender is probably bad.
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  #8  
Old 02-22-2008, 06:40 PM
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When my sender was failing it read low....and would jitter when slowing down/pressure decreased, and sat at just about 0 with a warm engine. Replaced it, worked fine for a day, failed completely and sat on 0. Replaced with a VDO sender and it worked perfectly. 2 bar at normal idle, 1.8 at hot off the freeway idle, and immediate to 3 bar on acceleration.

If replacing the sender, get the good one. (VDO)
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