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I believe that the "normal" range is between 15 lbs. and 40 lbs. Mine jumps to about 60 lbs. upon start-up – rests around 40 while driving – and sits at (or just a tad below) 15 at idle.
 

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I believe that my shop manual states that anything less than 35 psi at 2500 rpm is too low...
 
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