9 Best Oil Additives to Stop Engine Knocking (and Lifter Noise)

The best way to describe car engine knocking is an annoying pinging sound which comes from the engine area. There are lots of reasons as to why there would be engine knocking. Perhaps there is an imbalance in the air to fuel mixture, resulting in the gas burning unevenly.

Another reason for engine knocking is an inadequate amount of lubrication in the engine, particularly around the upper cylinder head. If the lifters and valves of this area are not properly lubricated with good strong oil, then it causes a pinging or ticking sound to be heard.

If you have an older engine, then the risk of engine knocking increases even more. Older engines tend to have more issues when it comes to lubrication. Even if you use synthetic oils to help expand their longevity, it still might not be good enough for an old engine which has rusted or corroded parts.

To fix this problem, there are special oil additives that you can add to your engine oil to help clear away this rust and corrosion. Once you do that, you might find the oil will flow smoothly again in the engine. As a result, there won’t be so much knocking or pinging anymore.

Top 9 Best Oil Additive Products

Below are the top oil additives to stop car engine knocking, especially for older engines.

1) Sea Foam SF16

best oil additive for lifter noise

Sea Foam SF16 is an environmentally friendly oil additive which is registered with the Environmental Protection Agency. Since it is 100% petroleum based, it will be good for both your engine and the outside surroundings.

The main benefit of Sea Foam is that it works to remove contaminants, gum, and varnish deposits from the engine. If this is an older engine which has over 200,000 miles on it, the Sea Foam additive will give it a power boost. Most importantly, it will quiet the engine down from knocking so much.

2) Archoil AR9100

best oil additive to stop engine knocking

Archoil AR9100 is a great oil additive, especially for cars that use diesel engines. If you’re currently experiencing friction, vibrations and other kinds of sounds coming from your engine, then these symptoms will be reduced greatly with this additive.

The same goes for gasoline engines as well. Archoil AR9100 can not only reduce engine sounds, but it can enhance the functionality of the hydraulics, gearboxes, and power steering too.

3) Liqui Moly Cera Tec Friction Modifier

quiet noisy lifters

The Liqui Moly Cera Tec Friction Modifier blends well with most commercial engine oils. This gives you the freedom to choose virtually any oil and it will still be compatible with this additive. Liqui Moly is a great oil additive for anyone who drives long distances and wants better efficiency.

It also works well in very cold or very hot environments. Most importantly, it will lower the chances of deposit buildup in the filter system. If you currently have a noisy engine, that should get reduced too.

4) Lucas Heavy Duty Oil Stabilizer

oil additive to quiet engine noise

The Lucas Heavy Duty Oil Stabilizer is an oil additive that will last you for at least 2 years. It will prolong the lifespan of your existing oil, so you won’t need to get oil changes as frequently.

The main benefit of the Lucas Heavy Duty Oil Stabilizer is that it reduces the oil consumption rate. This will allow your engine performance to be optimized. You’ll have more miles per gallon and virtually no more dry startups or knocking sounds.

5) Red Line Break-In Oil

oil additive to stop lifter tick

One bottle of the Red Line Break-In Oil additive will last you through two oil changes. Your pistons will have less slick oil, so their rings can get into the proper seated position.

When you go to start your engine, there will be fewer noises and chatter as well. The two main ingredients of the additive are phosphorus and zinc.

6) BG MOA Oil Supplement

treatment for engine knocking

The BG MOA Oil Supplement is an oil additive that will increase your acceleration performance and reduce your RPM. According to many users, the benefits of the oil additive are still there after you drive 5,000 miles and get an oil change.

There will be fewer knocking sounds because the additive will help make the engine resistant to corrosion.

7) Rev X Fix Oil Treatment

best high quality oil treatment

If the fuel injectors get stuck a lot in your vehicle, Rev X Fix Oil Treatment can help with this problem.

This premium oil additive will increase the efficiency of your engine, whether it is a gasoline engine or diesel engine. There are no corrosive materials in this additive either.

8) Lucas Engine Oil Stop Leak

Lucas engine oil stop leak

The Lucas Engine Oil Stop Leak will lower the rate of oil consumption in your engine. Meanwhile, the oil pressure will increase to enhance the engine performance.

During your next oil change, simply use one quart of stop leak in place of one quart of motor oil. Whether you have oil that’s conventional, synthetic, or a synthetic blend, this additive will work well with it.

9) BestLine Premium Synthetic Engine Treatment

synthetic oil engine treatment

BestLine Premium Synthetic Engine Treatment reduces the engine’s friction and overall wear and tear. It will give you a better fuel economy and engine performance as a result.

Any strange vibrations or sounds coming from the engine should be reduced after the second startup with this additive in your oil.

4 thoughts on “9 Best Oil Additives to Stop Engine Knocking (and Lifter Noise)”

  1. I have a tapping noise in my 2012 Kia Forte…135,000 miles. What engine additive would be my best bet to buy to virtually eliminate the tapping noise?

    • Depends on why it’s tapping. I hate to break it to you, but an additive probably won’t fix the problem. I’d have it inspected at a shop if you’re concerned about the noise. Some cars need a valve adjustment depending on the type of lifters they have. Other cars just have noisy lifters.

      Some factory service manuals will specify how much valvetrain noise is considered normal. It might say something like: “if you experience lifter noise for longer than 10 minutes on startup, replace X”. If you have a factory service manual on hand, check it out and see what it says.


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