2) Archoil AR9100Īrchoil AR9100 is a great oil additive, especially for cars that use diesel engines. Most importantly, it will quiet the engine down from knocking so much. If this is an older engine which has over 200,000 miles on it, the Sea Foam additive will give it a power boost. The main benefit of Sea Foam is that it works to remove contaminants, gum, and varnish deposits from the engine. Since it is 100% petroleum based, it will be good for both your engine and the outside surroundings. Sea Foam SF16 is an environmentally friendly oil additive which is registered with the Environmental Protection Agency. 9) BestLine Premium Synthetic Engine Treatmentīelow are the top oil additives to stop car engine knocking, especially for older engines.3) Liqui Moly Cera Tec Friction Modifier.As a result, there won’t be so much knocking or pinging anymore. Once you do that, you might find the oil will flow smoothly again in the engine. 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. 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. Older engines tend to have more issues when it comes to lubrication. If you have an older engine, then the risk of engine knocking increases even more. 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. Perhaps there is an imbalance in the air to fuel mixture, resulting in the gas burning unevenly.Īnother reason for engine knocking is an inadequate amount of lubrication in the engine, particularly around the upper cylinder head. There are lots of reasons as to why there would be engine knocking. The best way to describe car engine knocking is an annoying pinging sound which comes from the engine area.

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