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Originally Posted by billrei
Is this reading at idle or at speed? My oil guage pegs itself high at anything much above an idle so I would never notice the difference at speed. If you see a difference at speed I would be worried about your oil pressure.
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I noticed the higher oil pressure at both idle and high speed with the engine at normal operating temperature. My gauge pegs when the oil is cold and drops just below that when hot and never moves at anything above 1000rpm. It is still well into the "3" at the top of the gauge but the needle now sits just a bit higher since the oil change, At idle it would fall a fraction below the "2" but now sits on the "2" mark. I think my oil pressure is just fine.
I think Brian may be right about the slight difference between old and new oil, although I have never noticed it before and the "old" oil was only in there for 5k miles.
As far as viscosity range is concerned I doubt there is any validity to that, at least with true synthetics. When Mobil-1 was first introduced it was sold as a 0W-50 and met all testing requirements for that range. The story I heard (from an Exxon retiree) was that the auto shops and retail outlets complained because nobody would bother changing their oil from summer to winter and they would lose some business, so Mobil repackaged it with conventional viscosity ranges.
