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Once stopped, fuel injector(s) may be leaking and flooding the engine. Hook up fuel pressure gauge and run engine, then watch gauge when you turn off. If pressure quickly drops, pull spark plug(s) to see if they are gas soaked.
As engines age, there is wear between the bearing surfaces which allows a greater oil flow and hence a lower oil pressure to these critical parts. If you notice that it is higher when it is cold and first started, and then it enters the red once it is heated up and at idle or at a stop light, you can assume that your engine some bearing wear that is preventing oil pressure to builed. 40PSI is OK at running and it is possible that you have other issues at work here such as a weak oil pressure relief spring, plugged sump pickup or other. For the simple fix, I would tend to trust the gauge and go for a slightly 'thicker' oil. If you are currently using a 5w-30 which is the summertime recommended oil for this car, try using a slightly heavier weight oil such as 10w-30. You could even bolster the pressure more by going to a 20w-50, but at some point, you are reducing the effectiveness of the splash effect of the oil on the piston oiler rings. Good Luck.
They may be right. Too much clearance on the bearings is where you lose oil pressure, or so I've heard. If you bought it used, someone may have once run old, dirty oil in it too long, or let it run low. You could drop the oil pan and check the bearings or replace them.
At this point I would strongly suggest that you have your mechanic hook a mechanical oil pressure guage to the engine and make absolutlely sure that the pressure is up to manufacturers standards. It may simply be a failing oil pressure sending unit, but, until you know, it could turn out a lot more expensive! Thank you, Dana
your oil pump does that on purpose - more noticeable with a dented oilpan as pressure is slightly increased. nothing to do until it goes (if it goes) unless you want to throw parts at your car anyways.