5.7 Hemi Oil Pressure Drops at Idle (Explained)

5.7 Hemi Oil Pressure Drops at Idle

If you want to understand what causes oil pressure drops at idle, then you should learn about oil pressure and the importance of correct oil pressure in the first place.

 Oil pressure requires several elements or components to make sure of the proper maintenance.

 It involves the oil pump, the distance, and the lubricant which are required to travel to every part and corner of the engine.

 But when the entire process collapse for low oil level, or faulty pressure gauge, or poor quality of oil, then oil pressure drops at idle on a 5.7 Hemi engine.

Therefore, you need to maintain the right pressure level, good quality engine oil, and correct pressure gauge to ensure the engine’s functionality. 

oil pressure-related problems in 5.7 Hemi.

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What is normal oil pressure for a 5.7 Hemi?

The standard oil pressure for a 5.7 Hemi engine is between 25 PSI and 65 PSI. But you must change your oil from time to time to get the normal oil pressure on your 5.7 Hemi engine. As a rule of thumb, every 5000 to 10000 miles will be normal. 

What causes oil pressure to drop at idle?

Low oil pressure causes oil pressure to drop at idle. Your 5.7 Hemi engine can get low-pressure oil for two specific things. One is when your engine will stay low on oil and the other is because of the high oil temperature.

If you can fix both the issues, then your engine’s oil pressure won’t drop at idle. Sometimes, even a defective oil pump can also be responsible for causing oil pressure to drop at idle. 

Why oil pressure drops when idling?

When the oil level read between “add” and “full” on the dipstick, then the most possible reason for low pressure would be worn-out engine bearings. This should be the reason if your engine has very high mileage. 

What should the oil pressure be on a 5.7 Hemi?

The oil pressure should be between 25 and 65 PSI on a 5.7 Hemi engine. You are also required to change the engine oil regularly to avoid facing any idle issues with your engine.

If you can ensure these two things, then your engine will function properly and last for a very long time as well. 

Why does my oil pressure drop when idling?

If your oil pressure drop when idling, it will mostly refer that your engine is currently low on oil. When more power is provided to the engine through acceleration, then the pressure will eventually build up inside the engine.

Therefore sometimes high oil temperature can cause low oil pressure. A damaged oil pump can also lead the way to an oil pressure drop when idling.

Uncontrolled wear decreases the original flow restriction and which eventually drops the pressure afterward. 

How much oil pressure should a 5.7 Hemi have at idle?

This stat varies from car to car because every car has a different mechanism to work with the engine. As it is not a fixed or specified vehicle for a 5.7 Hemi engine, therefore we can only provide standard data on oil pressure for a 5.7 Hemi at idle.

But you must take some other features and data into consideration while doing so. If a 5.7 Hemi engine runs about 25 PSI hot at idle and 50 PSI hot in cruising, then the standard oil pressure should be from 25 PSI to 65 PSI when the Hemi oil is hot and warm.

You need to follow the rule of thumb here which is 10 PSI/1000 RPM. 

How do you fix low oil pressure at idle?

If your oil pressure provides a too low reading at idle, then it can be evidence that your engine is wearing off. To solve this issue, you may try using a higher-viscosity oil. It may help you fix this issue as many people got results using it earlier.https://www.youtube.com/embed/DpBOxYQtVM8

Another way to fix this problem is to make a switch from 5W-20 to 10W-30. But you can bring this change only if you are not already using 10W-30. 

What does it mean when oil pressure drops to zero?

If your oil pressure drops down to 4 PSI with a 5.7 Hemi model engine, then it is cutting a signal to the fuel pump relay asking to shut off your fuel pump immediately.

Theoretically, when your instrument cluster oil gauge will provide a zero reading at times, then your truck will shut off that very moment. 

What are the symptoms of a falling oil pump?

There are three main symptoms from which you can understand your oil pump is a falling one and you need to replace it as soon as possible.

High engine temperature, low oil pressure, and noise are the three main signs that indicate you to fix or replace your oil pump.

Though most drivers around the world may never require to replace their oil pumps, it is very important to learn about the symptoms so that you can identify them when you are experiencing this problem. 

Why my truck does loses oil pressure when I stop?

If your oil light flickers will go on and off while you stop or keep your vehicle idle, then there may have two reasons behind this. One is because of the problem with the oil sensor or the second one is if the pressure is very low.

Your engine should have at least 5 PSI even when it is not moving. When the PSI is below 5, then this will eventually trigger the oil light and therefore it will go on and off. 


Many of us are still not aware that engine oils play a vital role in keeping the engine at its prime operating circumstance. They are the ones who ensure the lubrication and protection of all the moving parts.

But to ensure the arrival of the engine oil to all parts and corners, the pressure should be built up and it is built up when the engine oil will be flowing through the openings inside the engine. Therefore drivers notice a low oil pressure at idle and start worrying about that.

This low oil pressure is mostly caused by a faulty pressure gauge, low oil level, worn fuel pump, poor quality of oil, or by the wrong kind of engine oil.

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