A few questions about oil pressure.

A few questions about oil pressure.

For starters, if I run down to the corner store 2 miles away, what should my oil pressure guage say:
a. when I start the engine.
b. when I am pulling away and headed to the store.
c. along the way to the store.
d. when I've arrived and put the tranny in park and before I turn the engine off to exit the vehicle.
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nickg5Asked:
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sweetfa2Commented:
Have you got an oil pressure gauge that talks?

If not, it will say nothing.

On a more serious note, if you want a more serious answer, then you need to be specific about make, model, engine size and type, the type of oil pressure gauge, etc.

Apart from that, the oil pressure should stay pretty much constant for the entire time the engine is running.
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nickg5Author Commented:
2001 Chevy S-10 pickup.
Oil pressure guage has a low of 40 and a high of 80.

Per another question someone said when the truck is accelerating the pressure will go up.
Are you saying it should be a "specific" number, 50 for example, when the engine is started, through the entire trip, and after arriving but before the engine has been turned off?
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sweetfa2Commented:
The pressure goes up initially when it starts then settles.  There will be negligble differences in the amount registered by the gauge because the sensitivity of the gauge is limited so will be difficult to visually detect.

The actual value will vary depending on the cleanliness of the oil, the age of the oil filter and the general age of the engine.  Most gauges tend to be tuned so that a normal level is around the 30% mark of the gauge as a normal operation, so in your case somewhere around 55 would be an expected level.
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Michael-BestCommented:
a. from 0 to idle pressure.
b. from idle pressure to maximum presssure depending on engines RPM.
c. from idle pressure to maximum presssure depending on engines RPM.
d. from maximum presssure depending on engines RPM to idle pressure.
 
Oil pressure is lowest under hot idling conditions, and the minimum pressure allowed by the manufacturer's tolerances is stated in your cars manual.
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nickg5Author Commented:
It depends on what you mean by idle pressure and that is part of my question.
What should it be at idle before leaving and after arrival?

And maximum RPM's at 45 miles per hour.
The entire trip was 10 miles and no more than 45 miles per hour.
Not exactly a strain on the engine.
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Michael-BestCommented:
Engine RPM, oil temperature and oil grade (also engine condition) all have major effect on oil pressure.

These numbers are in the normal range:
Oil pressure 50 psi revved up.
Oil pressure 25 psi at idle.
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nickg5Author Commented:
These numbers are in the normal range:
Oil pressure 50 psi revved up.
Oil pressure 25 psi at idle.
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85,000 miles on the truck.

Oil pressure 1/4 mile from departure was near 80, maybe 75, the engine did not "sound right."
Within the next 1/4 mile engine noise back to normal, pressure dropped to maybe 65-70. Never during the trip was it as low as 50.
I drove the truck yesterday for the same 10 mile trip and the pressure was seen at around 60-70 idle, accelerate, frequent stops, arrival, idle, shut down the engine.
It has not been seen at 25 in idle for as far back as I can remember.

Even on the long trip where the crank sensor went bad and the mechanic who replaced the sensor said the load of the 18 cargo trailer had 0% to do with the sensor going bad. On that trip of 450 miles, pressure guage ranged from 65-70 high to 40-45-50 low, or idle.
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Michael-BestCommented:
My numbers are for the hottest engine oil pressure lows.

Your numbers are normal for a cool engine using a good multigrade oil for a short 10 mile trip.
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nickg5Author Commented:
80 on a guage of 40-80 is normal?
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Michael-BestCommented:
Are you using the correct multigrade oil for your climate?
Further info here:
http://lubricants.s5.com/oil_pressure.htm
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nickg5Author Commented:
I've driven 2500 miles on the truck since I have owned it. The previous owner, a relative, changed the oil before giving it to me, so I do not know the grade of oil, but the owner was dealer religious so I'd assume the dealer used the proper grade oil.
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Michael-BestCommented:
Your milage indicates that you are soon due an oil change and an oil filter change.
Over pressure can be caused by a blocked oil filter also the wrong grade oil.

Since you have no documentation of replcement of both that either may be the cause, then I would recommend replacing both.
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Michael-BestCommented:
Also consider that your oil gauge may be faulty or worse still,  the oil pressure is not correctly controlled by a faulty or blocked "bypass" valve inside the engine.

Normally operation: once the oil pump builds enough pressure (50-60PSI) , any additional volume is "dumped" back into the crankcase so that the oil lines don't build up too much pressure and damage the oil pump.

"around 60-70 idle"

If you are using an electrical design of the oil sensor circuit then it may be time to replace the oil gauges sensor unit.
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nickg5Author Commented:
I'll change the oil and filter and see if there are any changes. I'm not clear why 80, the highest pressure on the guage is considered normal. The far right reading on the other guages would all indicate a problem like over heating, battery issues, etc. (except fuel of course with totally right being a full tank)
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nickg5Author Commented:
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