[R129 SL] Oil pressure question

[Oldbenz1 at aol.com]

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   
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.pairlist.net/pipermail/r129list/attachments/20110717/c666ec02/attachment.htm>