Why The Oil Pressure Light Comes On When The Engine Is Hot?

Written By: Terrence Hines
Category: Engine Oil

Generally, when the oil pressure light comes on when the engine is hot, many motorists encounter an issue. This typically occurs when the oil level or viscosity of the motor oil is too low.

If you notice such an indication, you might need to change the amount of oil and the thickness of the motor oil you are using. This could fix the problem.

The Oil Pressure Light Comes On When The Engine Is Hot – 11 Reasons

Oil pressure is an important part of a healthy engine; it ensures that the moving parts of your engine have enough lubrication.

If your oil pressure light comes on when the engine is hot, there may be an issue with the amount of oil in the system or how it’s being circulated.

Oil leaks, bad seals, and clogged oil filters can lead to low oil pressure levels and cause the sensors to indicate that the light should come on.

Oil pumps can also wear out, leading to a decrease in overall pressure. Therefore, taking your vehicle in for regular maintenance and checking fluid levels regularly is important.

You should also replace any worn or damaged parts. This will help ensure that your oil pressure remains high and keeps your engine running smoothly.

1. Low Oil Pressure:

Oil Pressure is a critical component of ensuring your engine is running properly.

The Oil Pressure Light Comes On When The Engine Is Hot - 11 Reasons

When your oil pressure begins to dip, the oil pressure light on your dashboard will illuminate when the engine is hot.

This means you should get your vehicle checked by a certified mechanic as soon as possible.

A drop in oil pressure can be caused by many different things, including a clogged oil filter, evidence of sludge in the oil, or too much pressure to pump oil into the engine.

Your mechanic can figure out which of these issues is causing the oil pressure warning light to come on and resolve it for you.

Either way you look at it, having low oil pressure isn’t something to take lightly, so it’s best not to delay getting help from a professional.

2. Dirty Or Contaminated Oil:

Oil is a vital part of any car engine, and it needs to be cleaned and properly maintained in order to keep the engine running smoothly.

However, if the oil is not clean, it can cause problems. For example, oil can get dirty from things like dirt and debris. Or, the oil can become less thick over time if it gets too hot or is used a lot.

When this happens, the oil pressure light comes on when the engine is hot.

It is important to replace the oil in your car as soon as possible. In addition, you should check the oil levels regularly and have the car serviced. This will help avoid problems and keep your car running well.

3. Clogged Oil Filter:

Oil filters play an important role in maintaining the health of your engine by trapping dirt, sludge, and other impurities that would otherwise hamper your vehicle’s performance.

Unfortunately, oil filters can become clogged over time, leading to a decrease in the amount of oil released while driving.

This decrease can cause engines to overwork themselves, resulting in a drop in fuel efficiency and potential damage due to overheating.

Clogged Oil Filter

If left unchecked, a clogged filter can trigger the oil pressure light once the engine is hot, warning you that it’s time to replace your filter before further damage.

4. Worn Piston Rings, Valves, Or Bearings: 

Oil pressure and engine temperature are closely related, and a worn piston ring, valve, or bearing can cause the oil pressure light to come on when the engine is hot.

This happens because when these parts degrade, the gap between them increases.

Oil may leak through this gap, leading to lower oil pressure in the engine and triggering the light while the engine is hot.

If you’re seeing this warning sign on your dashboard–even if your oil level appears normal–it’s important to have your vehicle serviced by a professional mechanic as soon as possible.

Allow an experienced technician to properly diagnose and repair what’s causing the problem so you can avoid major mechanical issues down the road.

5. Faulty Engine Seals:

If your oil pressure light suddenly turns on and remains illuminated even when the engine is hot, this could indicate faulty seals inside.

If your car normally has a low oil level, this might mean a problem with one or more engine seals. This could cause leaks, even if there is enough oil pressure.

In any situation like this, ensure you get your vehicle checked out immediately for proper maintenance and repairs.

If this happens, trying to drive further risks permanent damage to your vehicle and can even result in a stalled motor.

In any case, it’s important to take your car to a qualified technician for inspection and repair as soon as possible!

6. Broken Crankshaft Or Connecting Rods:

When it comes to automotive issues, the oil pressure light comes on when the engine is hot can be a sign of several underlying problems.

One common issue could be that the crankshaft or connecting rods are broken, affecting the engine’s oil supply.

Oil pressure keeps all the parts in an engine moving smoothly and efficiently. If the crankshaft or connecting rod is damaged, it affects oil flow and could cause oil levels to drop.

This would make it, so there is less oil for the engine. Unfortunately, this can cause severe damage to the whole system over time and result in expensive repairs if not fixed right away.

The Oil Pressure Light Comes On When The Engine Is Hot

For any oil pressure light malfunctions, it’s important to have a professional run a diagnostic test to ensure this underlying issue isn’t present.

7. Faulty Oil Pump:

If the oil pressure light illuminates your car after running at a warm temperature for some time, there is an excellent chance that you’re having issues with a bad oil pump.

This can result in discomfort from reduced performance, increased engine noise, and even more significant long-term damage if not addressed immediately!

This is an indication that there may be something wrong with the oil pump, and it needs to be inspected.

Oil pumps are essential in keeping engines lubricated, so if yours isn’t performing correctly, it can result in major problems down the line and dramatically decrease your engine’s lifespan.

It’s best to check this issue out as soon as the oil pressure light goes on – it’ll save you from even more costly repairs later!

8. Blocked PCV Valve:

If your oil pressure light comes on when the engine is hot, a clogged Positive Crankcase Ventilation (PCV) valve might be the culprit.

Knowing the signs of this issue makes it simple to identify and address.

The PCV valve helps release pressure from the crankcase, allowing air and exhaust gases to flow between it and the intake manifold.

If your vehicle’s vent line is clogged, the oil pressure light may turn on due to an increase in pressure that can cause damage to the engine.

It’s important that you properly clean or replace a blocked PCV valve when this happens so that you don’t end up with long-term damage or expensive repair bills down the line.

9. Incorrect Oil Viscosity Or Type Of Oil Used:

To ensure optimal engine performance, it is essential to maintain the correct oil viscosity.

Utilizing an improper type of oil or the wrong viscosity level can trigger your vehicle’s oil pressure light, serving as a warning sign.

When oil viscosity is too low, it cannot safeguard engine parts under stress and heat.

Conversely, a thicker viscosity can result in inadequate lubrication of components which can lead to premature wear or destruction.

If your oil pressure light comes on when the engine is hot, it’s possible that you need to check your oil type or viscosity grade and make sure it’s according to specifications.

Getting the right oil for your engine could help keep all its components safe and efficient.

10. Low Coolant Levels In The Engine Cooling System:

Low coolant levels in the engine cooling system can cause many issues.

If there is not enough coolant in the system, the engine may overheat, so an oil pressure light comes on when the engine is hot.

This means there is insufficient lubrication for all of the parts to move freely, as was designed by the manufacturer.

To ensure your car runs optimally and survives for many years, regularly inspect your vehicle’s antifreeze levels once a month.

 Low Coolant Levels In The Engine Cooling System

If needed, fill up with coolant to avoid potential damage caused to hoses, radiators, or pumps down the line. Taking this simple preventative action can save you time and money long-term!

11. Excessive Carbon Build Up In The Engine Chamber:

Excessive carbon build-up in an engine chamber can be a major cause of concern.

Oil pressure light comes on when the engine is hot is a sign of too much carbon, which can lead to inefficient performance and eventually decreased engine life.

Keeping the carbon build-up in check is paramount, as it limits the amount of fuel that can be appropriately burned to generate energy.

Consequently, this leads to an increase in bio-fuel or gasoline consumption and a larger emission of greenhouse gases into our atmosphere.

If you see your oil pressure light turn on, it is a good idea to have someone who knows about cars look at it. This will ensure your car gets the maintenance and repairs it needs.


It is important to take notice if your oil pressure light comes on when your engine is hot.

It could be a warning sign of a bigger problem if this happens. It might need to be fixed immediately by someone who knows how to do it.

For example, the oil pump might malfunction, the filter could be blocked, or the bearings may need repairing.

Oil ensures that all the components within an engine are properly lubricated and working together smoothly.

Therefore, ensuring your oil pressure light is off at all times will help avoid potential major repairs down the road, save money and, most importantly, keep you driving safe.

Terrence Hines

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