[W124] low oil pressure

Alec Cordova w124list@mbcoupes.com
Sat, 24 May 2003 12:35:08 -0500


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This behavior is not unusual, and it is not outside acceptable performance,
as described by MB.

For the slow initial oil pressure, you might check the specific brand of oil
filter installed. With our upside-down oil filter, you need one with an
effective anti-drainback valve. OEM filters from Mann or Hengst work
perfectly for me. Some other filters make my 89 take a few seconds to show
oil pressure, during which time you can hear some valvetrain noise.

The drop in idle oil pressure could be an indication that your motor oil is
starting to break down. All oils will do this, just at different rates.
Official position is that you can get as low as 0.8 bar of oil pressure on
the gauge at idle, as long as it hits 3 promptly when you increase engine
speed. Mine is probably borderline. She idles under 1.5 (closer to 1.0) and
doesn't firmly hit 3 until about 1400 RPM.

I seriously doubt you have caused any harm to your motor, but I would
suggest it's time for another oil and filter change. Try a different brand
of motor oil, preferably one on the MB 229.1 list
(http://www.whnet.com/4x4/oil.html has good info), and a Mann, Hengst,
Knecht, or Bosch oil filter. I buy my filters from Rusty
(http://www.buymbparts.com) and change my own oil, so I have full control
over the brands used. When the local quick change oil places would still
work on a Mercedes, I would still buy my filters from Rusty and bring them
with me. They give you a buck or two discount for supplying your own filter,
and filters cost me 4 or 5 a piece from Rusty, but I would always have
prompt oil pressure on startup.

Alec Cordova
Taylor, Texas
89 300CE, 157K
  -----Original Message-----
  From: w124list-admin@mbcoupes.com [mailto:w124list-admin@mbcoupes.com]On
Behalf Of Edik Mirzakhanian
  Sent: Saturday, May 24, 2003 12:21 AM
  To: w124list@mbcoupes.com
  Subject: [W124] low oil pressure


  Hi,
  I have a 1988 300 ce which I really enjoy. I have been driving 5000 km
since the last engine oil change. "6 mounths"

  The oil pressure stands at 3 bar when I start the engine but it takes
about 2 sec to get there. Is this normal ? I do not think that it was like
this before! And when I stop at the red signs after a few minutes drive, the
pressure is down to 1,5 bar. For like 1 mounths ago, it usually standed on
2 - 2,2 bar.

  What is the normal oilpressure level. Shall I change the oil?


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<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Dus-ascii">
<META content=3D"MSHTML 6.00.2800.1170" name=3DGENERATOR></HEAD>
<BODY>
<DIV><SPAN class=3D607081917-24052003><FONT face=3DArial color=3D#0000ff =
size=3D2>This=20
behavior is not unusual, and it is not outside acceptable performance, =
as=20
described by MB.</FONT></SPAN></DIV>
<DIV><SPAN class=3D607081917-24052003><FONT face=3DArial color=3D#0000ff =

size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D607081917-24052003><FONT face=3DArial color=3D#0000ff =
size=3D2>For=20
the slow initial oil pressure, you might check the specific brand of oil =
filter=20
installed. With our upside-down oil filter, you need one with an =
effective=20
anti-drainback valve. OEM filters from Mann or Hengst work perfectly for =
me.=20
Some other filters make my 89 take a few seconds to show oil pressure, =
during=20
which time you can hear some valvetrain noise.</FONT></SPAN></DIV>
<DIV><SPAN class=3D607081917-24052003><FONT face=3DArial color=3D#0000ff =

size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D607081917-24052003><FONT face=3DArial color=3D#0000ff =
size=3D2>The=20
drop in idle oil pressure could be an indication that your motor oil is =
starting=20
to break down. All oils will do this, just at different rates. Official =
position=20
is that you can get as low as 0.8 bar of oil pressure on the gauge at =
idle, as=20
long as it hits 3 promptly when you increase engine speed. Mine is =
probably=20
borderline. She idles under 1.5 (closer to 1.0) and doesn't firmly hit 3 =
until=20
about 1400 RPM.</FONT></SPAN></DIV>
<DIV><SPAN class=3D607081917-24052003><FONT face=3DArial color=3D#0000ff =

size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D607081917-24052003><FONT face=3DArial color=3D#0000ff =
size=3D2>I=20
seriously doubt you have caused any harm to your motor, but I would =
suggest it's=20
time for another oil and filter change. Try a different brand of motor =
oil,=20
preferably one on the MB 229.1 list (<A=20
href=3D"http://www.whnet.com/4x4/oil.html">http://www.whnet.com/4x4/oil.h=
tml</A>&nbsp;has=20
good info), and a Mann, Hengst, Knecht, or Bosch oil filter. I buy my =
filters=20
from Rusty (<A =
href=3D"http://www.buymbparts.com">http://www.buymbparts.com</A>)=20
and change my own oil, so I have full control over the brands used. When =
the=20
local quick change oil places would still work on a Mercedes, I would =
still buy=20
my filters from Rusty and bring them with me. They give you a buck or =
two=20
discount for supplying your own filter, and filters cost me 4 or 5 a =
piece from=20
Rusty, but I would always have prompt oil pressure on=20
startup.</FONT></SPAN></DIV>
<DIV><SPAN class=3D607081917-24052003><FONT face=3DArial color=3D#0000ff =

size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D607081917-24052003><FONT face=3DArial color=3D#0000ff =
size=3D2>Alec=20
Cordova</FONT></SPAN></DIV>
<DIV><SPAN class=3D607081917-24052003><FONT face=3DArial color=3D#0000ff =

size=3D2>Taylor, Texas</FONT></SPAN></DIV>
<DIV><SPAN class=3D607081917-24052003><FONT face=3DArial color=3D#0000ff =
size=3D2>89=20
300CE, 157K</FONT></SPAN></DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px =
solid">
  <DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
  size=3D2>-----Original Message-----<BR><B>From:</B> =
w124list-admin@mbcoupes.com=20
  [mailto:w124list-admin@mbcoupes.com]<B>On Behalf Of </B>Edik=20
  Mirzakhanian<BR><B>Sent:</B> Saturday, May 24, 2003 12:21 =
AM<BR><B>To:</B>=20
  w124list@mbcoupes.com<BR><B>Subject:</B> [W124] low oil=20
  pressure<BR><BR></FONT></DIV>
  <DIV>Hi,</DIV>
  <DIV>I have a 1988 300 ce which I really enjoy. I have been driving =
5000 km=20
  since the last&nbsp;engine oil change.&nbsp;"6 mounths"</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>The oil pressure stands at 3 bar when I start the engine but it =
takes=20
  about 2 sec to get there. Is this normal ? I do not think that it was =
like=20
  this before! And when&nbsp;I stop at the red signs after a few minutes =
drive,=20
  the pressure is down to 1,5 bar. For like 1 mounths ago, it usually =
standed on=20
  2 - 2,2 bar.</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>What is the normal oilpressure level. Shall I change the =
oil?</DIV>
  <P>
  <HR SIZE=3D1>
  Do you Yahoo!?<BR><A=20
  =
href=3D"http://us.rd.yahoo.com/search/mailsig/*http://search.yahoo.com">T=
he New=20
  Yahoo! Search</A> - Faster. Easier. Bingo.</BLOCKQUOTE></BODY></HTML>

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