Because your engine and therefore oil pump are turning slower at idle. It is a normal condition unless you hear rattling also at idle.
We are going to need to know what engine it has.
a pickup can travel 300 miles in the same time that a car going 10 miles per hour faster can travel 350 miles. How fast is the car traveling?
A tool that measures air pressure in a tire or going through a pipe is called an air pressure gauge.
going faster than the speed of sound. It is a pressure wave of air that builds up in front of a plane, preventing it from going faster.
going faster than the speed of sound. It is a pressure wave of air that builds up in front of a plane, preventing it from going faster.
The oil pressure gauge is going to fluctuate on a Toyota Tacoma or any automobile. The oil pressure is less when the auto is idling and more when the auto is going down the road.
a pickup can travel 300 miles in the same time that a car going 10 miles per hour faster can travel 350 miles. How fast is the car traveling?
Check your oil pressure gauge, if your just going by what it says the gauge might be wrong Iv had this happen bout 4ish times and its always the tube running to the oil pressure gauge is pinched so its not getting a good reading.
sounds like the cam bearings may be going bad
Take the wire loose from the oil sending unit and then turn the key on and ground the wire to the engine somewhere and the gauge in the truck should go all the way past the highest point. If it don't then the gauge in the dash is bad are the wire going to it ( The 1 you grounded ) is broken. If the gauge is reading low oil pressure, Then unscreew the oil sending unit on the engine just behind the distributor, were you took the wire loose from. Then install a OIL PRESSURE GAUGE into it's place. Then start the engine and read the pressure, Now compare the reading on the dash gauge to what you are reading on the oil gauge.
You may need a new pressure gauge. They are inexpensive and can be found at any place that sells pool products. OR That may be all that you are going to get out of the system you have.
That, or the gauge is going. Or a loose wiring connection. I'd bet on the last.