[R129 SL] R129LIST Digest Oil Pressure

[Fred]

Rich - Probably the oil pressure sending unit.  




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Message: 1
Date: Sun, 17 Jul 2011 10:09:34 EDT
From: Oldbenz1 at aol.com
Subject: [R129 SL] Oil pressure question
To: r129list at mbcoupes.com
Message-ID: <9b0b.3adc5bd9.3b54471e at aol.com>
Content-Type: text/plain; charset="us-ascii"

My ;92 500SL exhibits a strange thing.  When the outside temperature  is
very high and engine coolant temp approaches 100C., the oil pressure drops
to very nearly zero at idle.  When engine RPM's are increased, the pressure
immediately increases to an acceptable level (between 2-3 atm).  The car
has less than 61,000 miles, has always been properly maintained, and  I
change oil at 3000 mile intervals.  I use Valvoline 10W-30W  and change oil
and 
filter at 3000 mile intervals.   I find it  hard to believe this is normal-

does anyone have ideas what's going  on?  
Rich Splaine