Unusual problem - Saab 9-5 Bulletin Board - Saabnet.com
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Unusual problem
Posted by Stephen Goldberger [Email] (more from Stephen Goldberger) on Thu, 28 Jun 2007 04:45:05
In Reply to: Re: Maximum oil pressure, Nathan [Profile/Gallery]
, Wed, 27 Jun 2007 19:43:06
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A greater concern for 9-5 owners is low oil pressure - either from a plugged intake screen or worn or improperly made oil pumps. The "geneva wheel" oil pump in the 9-5 is perhaps less robust than the gear-pump used in earlier cars. Chuck Andrews has documented a sequence of "new from the box" oil pumps that fail to deliver the specified pressure as shown in Anders' post.
I'd add that an *opening pressure* of 3.8 bar (55 psi) on the relief valve means that is the absolute least pressure you should see at high rpm, and that is with viscosity so low that just barely cracked open the relief valve is limiting pressure. Several PSI higher should be expected, if not 20 psi above spec.
Another issue is the accuracy of the gauge. Chuck Andrews went through a period of extreme angst when his imporperly calibrated "heads up display" gauge showed way-low oil pressure. A calibrated external gauge mounted on the oil cooler line showed pressures closer to spec (although a little low when using 10W30 oil).
Unless your high oil pressure is caused by a major blockage in the lubricating system, I wouldn't worry about it.
posted by 24.33.227...
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