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Oil pressure goes low when engine is warm - Blazer Chevrolet Cars & Trucks

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Metal expands when heated, you are losing pressure through a leak caused by the expanding metal. Its impossible to know where the pressure loss is.

Another possiblity is that the oil pressure sensor is failing at high tempurature. You could replace the sensor to see if that is the problem

Posted on Sep 13, 2009

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Oil light comes on at stops after engine is warm


if your saying that your low oil pressure light is coming on (or flickering) at engine idle , but goes out when engine is above idle (going along) this is sure sign you have a problem in your engines oil pressure system :
serious !~


some common reasons for this to occur are:

worn out engine parts allowing oil to leak out and not lube parts properly (hi engine miles)

low oil level -not enough oil inside engine to get pumped around proper


restriction in oil system - blockage in oil passageways even oil filter will count (hi miles)

Aug 05, 2016 | Cars & Trucks

1 Answer

What will cause low oil pressure gauge to enter red zone after temp is above 190*?


Odds are the engine and/or oil pump is wearing out.
A weak pump can cause low oil pressure, as can worn engine bearings.
The oil is pumped thru the crank bearings, then up to the top of the cyl heads. The pressure switch is midway up the block.
10w30 oil is made to be used between 0 degrees and 100 degrees. As the temp goes up the oil is supposed to get thicker, but only so much. So as the engine warms up the oil gets thinner and naturally looses some pressure. Thinner oil will "leak" thru worn engine parts.
You may luck out and have the pump replaced and fix the problem, but if it has more than 125,000 miles on the engine, the bearings are probably failing too.

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1 Answer

What should be oil pressure on 1999 Pontiac Bonneville?


I would not worry about the pressure you are seeing.
Cold oil will have a higher pressure and drop as it get warm. Also newer cars run lighter weight oil in an effort to get better gas mileage. You can run heavier weight oil if the lower pressure bothers you and as the mileage goes up on a car things wear and the pressure will drop.

Oct 06, 2014 | 1999 Pontiac Bonneville

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Oil light on after engine warm-up on idle


this means a mechanical gauge test is required to check actual pressure warm idling if low below 20 psi then the oil pressure pump relief is stuck open or engine bearing are worn

May 15, 2014 | 2005 Opel Astra 1.4

1 Answer

1987 new yorker 2.2 turbo oil pressure low on ilde


Hook up a mechanical test gage to the oil pressure port where the oil pressure sender goes and verify the oil pressure is at least 20-30 pounds at idle engine hot. If the oil pressure checks ok on the test replace the oil pressure sender. You should be able to borrow this gage from Autozone or O'reilly auto parts with a deposit and a credit card.

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After vehicle has warmed, the oil light comes on under 1100 rpms . rev the engine the light goes off


You can't trust the light sensor, so you need to get a mechanical gauge. A cheap capillary tube one is only $10.
You should also change oil.
If the engine has over 100,000 miles, you could consider 20W-50 oil.
You could also have a problem with fuel or ignition, causing oil dillution.
Does it look too thin or smell like gas?
It could also be the oil pump is bad, but that is not normally worth trying.
The number of miles on the engine would help.
But low idle oil pressure is not that important.

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1 Answer

2001 f150 super crew oil light comes on at low rpm goes off when i accelerate"


you must obtain an oil pressure gage you can use a inexpensive type like you would hang under your dash. remove the oil pressure sending unit from the engine, a little oil will leak out when you remove it, no big deal. install the add on gauge and see if the pressure at idle with the engine warmed up is over 20 lbs. if not you probably have bad crankshaft bearing but you would want to see what htings look like inside the oil pan.if the pressure goes up to about 60lbs when running fast. and is very low at idle the engine is probably worn out. if the oil pressure drops when it is running fast you may have a plugged oil screen.i have found paper towels and rags inside of engines.

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I have a 99 blazer and ever since I have owned it, it reads lower in pressure when idling, but will go up too 40 while driving. This is normal for the vehicle. If the pressure gets real low, and stays low, it means its time for an oil change.

As long as the pressure goes up when you give it gas, it is fine.

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1 Answer

Oil light is on


May be bad oil pressure sending unit. Best way to check is to connect a mechanical oil pressure guage to engine and check pressures when engine is warm. Should be no lower than 40 psi at idle when warm, no higher than 70 psi at 2000 rpm.

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1 Answer

Have a 1999 Z71 chev truck with 5.3 L engine that has fluctuating oil pressure. Started with low oil pressure after start with engine clak that disappeared after it warmed up. Changed oil and found sludge...


In some cases where the oil is not changed properly, the oil pump screen maybe plugging or your oil filter is defective. Fram is a good filter. If there is no problem found, replace the pressure sensor.

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