Why Does My Audi A4 Sound Like A Diesel?

If your Audi A4 sounds like a diesel and you're wondering why, you've come to the right place. We researched this issue, and here is what we found out.

Your Audi A4 may make a diesel sound because of issues with the following:

  • Oil
  • Camshaft chain
  • Wheels
  • Engine
  • Exhaust pipe
  • Spark plugs

A diesel sound coming from your Audi A4 may not indicate a problem, but you should check the car or have it inspected by a professional mechanic to see if something is failing. 

Continue reading as we go through a detailed explanation of why your Audi A4 sounds like a diesel and what you can do about it. In this post, we will also answer some frequently asked questions. Let's get started!

Why Does My Audi A4 Sound Like A Diesel?

Audi A4 B8.5 Quattro

Audi cars are popular because of their performance, quality, and comfort. They are also very stylish. You may find it annoying if your Audi A4 sounds like a diesel. Diesel engines tend to be louder than gas engines. Here are some reasons why your Audi A4 sounds like a diesel:

Issues With Oil

If you're experiencing a diesel sound when using your AudiA4, you should check if the oil is low or needs changing.

Most cars will have a low oil or oil change light indicator on the dashboard that serves as a warning. You can also check the dipstick to see if it is at its critical level and extra oil is needed.

If you just purchased a used AudiA4, you should check the oil or have it changed before driving. Remember to use an oil that is recommended for an Audi A4 or other oils approved by the company.

Read this article, "What’s The Best Oil For An Audi? [Inc. A4, A6, And Q5]," to find out which oil is best for your car.

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Problem With Camshaft Chain

If oil isn't the problem, you should check the camshaft chain or the tensioner. When this chain starts to run the rear camshaft, it may produce a rattling noise that can sound like a diesel.

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You can try to fix it with a camshaft locking tool or have the issue checked by a professional mechanic.

Click here to see this cam locking tool kit on Amazon.

Wheel Issues

You can also check the bearings on the wheels. A loose bearing can make a loud sound when it is under stress while the wheels are spinning.

You can determine if this is the reason by listening for a loud sound coming from the wheels.

If this is the case, you should tighten the bearings right away or have them repaired by a mechanic before it damages the wheels.

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Engine Problems

If you start your car and notice that the engine is making a loud noise, there may be a problem with its turbo or air intake.

You will know if the problem is coming from the turbo if you encounter power loss during acceleration. If it is an issue with the air intake, you will need to check the intake hoses to make sure they're not blocked or damaged. If you see signs of damage, take your car to a professional mechanic.

Kiev, Ukraine; Engine Audi S8 V8 TFSI

Problem With Exhaust 

A damaged exhaust system can also make your car produce loud noises. An exhaust system with a leak can lead to unusual sounds in your car. Driving with a leaky exhaust is not a good idea. This is a problem that should be checked by a professional mechanic and repaired promptly.

Faulty Spark Plugs

When your car makes a loud noise while idling, there may be an issue with your spark plugs. A faulty spark plug may be bad or just dirty. Faulty spark plugs can cause the vehicle to burn fuel in the wrong way and will, in turn, cause a loud noise.

When this happens, you need to have your Audi checked as soon as possible to avoid damage to other parts of the car.

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How To Get Rid Of Diesel Noise

Audi A4 B8.5 Quattro, Why Does My Audi A4 Sound Like A Diesel

It is annoying to hear a loud, diesel-like noise coming from your car while it's idling or while you're driving. Luckily, there are a few things you can do to reduce the noise. 

Install Soundproofing Material

You can use soundproofing floor mats to reduce the loud engine sounds. Another great way to reduce engine noise is to install soundproofing material as an engine cover.

It will reduce the noise coming from the engine. Make sure that the soundproofing material you use is compatible and designed for hood installation.

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Use The Right Fuel

Not all engines are created equal. They have different fuel requirements. Avoid putting the wrong type of fuel in your car. Using the wrong fuel can put pressure on the engine and result in loud noises.

Use Oil

The use of regular engine oil can contribute to your car's noise. Regular oil is not as lubricating as other types of oil. To lessen the sound in your car, try using synthetic oil, which provides better lubrication. It should reduce friction and noise.

Can An Audi Use Regular Gas?

 Side view of a Audi R8 gas cap with carbon side feature

As mentioned above, putting the right gas in your Audi is important. The difference between premium gas and regular gas is that premium has a higher octane rating than regular gas. 

However, there are some misconceptions that premium gas is better than regular gas. But this is not necessarily the case, especially if your car was not designed to use premium gas.

One drawback of premium gas is that it is usually more expensive than regular gas. This is why many Audi car owners want to know if they can use regular gas with their cars since they are known as classy, premium vehicles.

Audi owners are advised to use premium gas. This is especially important with the Audi A4 to avoid engine damage. This is because Audi A4 cars require premium gas that has an octane rating of 91 or higher. Using a gas that has a lower octane rating will put pressure on the engine, which may be risky.

Which Audi Is Better: Diesel Or Gas?

If you're trying to decide between an Audi with a diesel engine and one with a gas engine, there are a few factors you should consider. Knowing the positives and negatives of both can help you make the right decision.

Gas engines provide a smoother driving experience and generally have lower maintenance costs. A diesel engine may require more maintenance but can be more durable and fuel efficient. Your final choice will depend on your preferences and needs.

Wrapping Things Up

Car Audi A4 B9 wrapped in matte vinyl is standing on the parking

Owning an expensive, classy car like the Audi A4 can be very satisfying. But it can also be inconvenient, especially when you encounter issues with the car. 

Your Audi may produce a diesel sound for several reasons. Take note of the reasons we covered in this post and check if your car's noise is due to one of them. Be sure to take action so that your car isn't damaged.

Remember to check your car regularly. If you encounter problems and you're unsure of what to do, take the car to a professional mechanic. This will save you time and money in the long run.

If you found this post helpful, be sure to check out these related articles:

Does The Audi A4 Have Folding Mirrors?

How Many Miles Can An Audi Last? [Breakdown By Model]

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