10 Questions You Should to Know about Engine oil additive

07 Jul.,2025

 

What Is An Engine Oil Additive and Is It Worth It?

You stop by the auto parts store for new seat covers and floor mats. You stroll down an aisle with shelves and shelves of engine oil additives that promise to deliver better gas mileage, a cleaner engine, and more horsepower. Is your vehicle missing out? Is extra engine oil additive worth it?

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Learn more about oil additives before you pick one off the shelf and pour it into your vehicle's most important component — the engine.

What Is An Engine Oil Additive?

It’s helpful to know the primary purpose of motor oil itself before you can understand the function of an engine oil additive. Motor oil's function is to lubricate your engine and reduce friction between its many moving parts. Oil also plays a critical role in protecting against corrosion, helping remove contaminants, preventing sludge build-up, and keeping the engine cool.

Your everyday engine oil is already a combination of base oils and additives. "The base oils constitute 70-90 percent of the total and are created from natural gas or crude oil, while additives round out the remaining 10-30 percent and can be a variety of things," notes Pennzoil.

There are different additives for different applications. Additives can include detergents, anti-wear additives, friction modifiers, antioxidants, corrosion inhibitors, viscosity index improvers, and more. Millions of dollars and hours go into creating and testing oil formulations so that they're just right.

Most of the brightly colored bottles you see at the auto parts store are aftermarket or supplemental engine oil additives. Some claim to extend the oil’s life and others say they reduce engine smoking. However, there’s mixed research as to whether they do what they claim.

What Engine Oil Additives Do To the Engine

The majority of motor oils contain around 15% of additives. Without additives, the oil is essentially unable to perform its critical functions. Wear, oxidation, and decomposition can cause the oil to degrade over time.

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Engine oil can lose its additives the older the oil gets. Without the proper levels of these additives, you run the chance of increased wear and tear on your engine, potentially resulting in rust, corrosion, oil sludge, decreased fuel economy, breakdowns, overheating, and expensive engine damage.

That's one reason a driver might consider an aftermarket or supplemental engine oil additive between oil changes — they want to reinvigorate their oil as quickly as possible. The value of an additive, though, would be whether it contains the additives that have been depleted and if it offsets any of the other existing additives remaining in the oil. Many different types of oil additives work by attaching their molecules to an internal engine component. Too much of one additive may limit a second necessary additive from being able to do its job.

Are Engine Oil Additives Any Good?

The question of using aftermarket engine oil additives has been the subject of controversy for years, and the answer isn't a simple "yes" or "no." You may assume that since standard motor oil already contains additives, any additional additives aren't necessary. But it's not always that black and white. You'll want to do your research, consult your vehicle manufacturer, particularly if your car is still under warranty, and make the decision for yourself.

"When it comes to supplemental additives, I always say it's a consumer's choice," says Shell Lubricants Global OEM technical manager. "Petroleum chemists and automotive engineers are really smart people who know what is and is not needed,” he says. “Oil already comes with additives in it to do certain things, so the consumer should piggyback off that knowledge and lean towards oil additives that are carefully formulated into the oil by the oil manufacturer to provide extra improvement in those areas.”

There are two factors to consider when deciding if aftermarket oil additives are a good idea for your vehicle, including:

  • Warranty: Most importantly — double-check your manufacturer's warranty. “Adding additional [aftermarket] additives to an engine oil could unbalance the additive system, resulting in detrimental side effects and potentially invalidating the engine manufacturer’s warranty,” reports the OEM technical liaison for Petro-Canada Lubricants.
  • Mileage and Vehicle Age: The more miles you have on your engine, the more likely it is that your engine is operating at less-than-maximum performance, making it more vulnerable to possible damage. The addition of certain oil additives carefully balanced into a fully-formulated high mileage engine oil has the potential to reduce stress and wear on your high-mileage engine and help restore performance. Consistently using a quality high-mileage oil can help.

Start with an Oil Change

When it comes to what's best for your engine, adding aftermarket engine oil additives may be a bit of a gray area. Ultimately, getting regular oil changes with high-quality oil that meets your vehicle manufacturer’s recommendation can be more beneficial for your vehicle’s long-term performance and comply with your vehicle’s warranty.

At Firestone Complete Auto Care, we’ll always prioritize what’s best for you and your car! That’s why we use high-quality motor oil brands like Pennzoil and always refer to your manufacturer's suggested maintenance recommendations to decide which type of high-quality oil to use on your engine.

Engine oil additives - are they good or bad? - The Grenadier Forum

TheDocAUS

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Before using an engine oil additive, take a look at this video first (it has interesting comments about how the additives can affect your oil's additives):

View: https://youtu.be/CAGT5inQScE

In short, he is not a fan and he explains why, based on science not speculation (to quote the Geek himself). Last edited: May 28,
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In short no. No speculation and proven by oil sample reports I have seen through work. Oil additives a relic of the long past. Modern high quality oils are well formulated and designed for current emission systems and engine designs. Extra additives and certain chemical additives in oil can cause failures of DPFs. Engine oil flush can be risky too. If an engine is well serviced there should be no need to flush the lubrication system. Engines that are poorly serviced or not serviced to operating conditions may survive a bit longer but the damage is done. Most engine manufacturers do not recommend engine flushing. Shorter oil change intervals are a better option for keeping an engine clean. The few places that oil additive do work are in hydraulic systems, diffs and manufactures are strict in recommending particular types of application specific additives.

TheDocAUS

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He does not recommend oil flushes in another video, not because they do not work, but because they can clog the oil filter, etc That is they work too fast and can have unforeseen consequences.

Tazzieman

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A dishwasher tablet in your bathwater will clean your skin, but would you risk it?
I think over the past 20-30 years we have learned using appropriate modern oils, a Goldilocks oil change approach ( not too often or too late) and replacing the filter is the correct and "clinically proven" method of ensuring engine longevity.
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Dishwasher detergent is the best
A dishwasher tablet in your bathwater will clean your skin, but would you risk it?
I think over the past 20-30 years we have learned using appropriate modern oils, a Goldilocks oil change approach ( not too often or too late) and replacing the filter is the correct and "clinically proven" method of ensuring engine longevity.
Dishwasher detergents and tablet are very good at cleaning contaminated cooling systems as they don't foam. Gentle on seals and not as aggressive as radiator flush particularly on older engines. Last edited: May 28,

TheDocAUS

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INEOS got a mention in the video, apparently they make base oils used to make synthetic automotive oils.

Tazzieman

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Dishwasher detergent is the best
Dishwasher detergents and tablet are very good at cleaning contaminated cooling systems as they don't foam. Gentle on seals and not as aggressive as radiator flush particularly on older engines.
Perfect for diesels then!

trobex

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Synthetic oils these days - no problems on their own.

FlyingTexan

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You can add a additive to help flush the engine and run it for a half hour or so then drain it. I have cleaned out some serious sludge in the past. Outside of that = BAD Last edited: May 28,

YIPPE

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Never used the oil additives. But was a long time user of diesel additive. Mainly to keep injectors clean and moss growth out of the tank. I never had any problems... Whether that was due to it working I can't be certain.

Shaky

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Never used the oil additives. But was a long time user of diesel additive. Mainly to keep injectors clean and moss growth out of the tank. I never had any problems... Whether that was due to it working I can't be certain.

With you on this one buddy. I think diesel additives are a positive when used correctly.

I am a big believer in Wynns Gold diesel treatment for a good clean out, or if things are getting a little Smokey. I wouldn’t use this one on a regular basis though.

bemax

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I do not think that additives are useful in such elaborated motors. Look at the specifications the oil has to meet and you see that it is not the cheap stuff you can get in every diy market.
the oil recommended by Ineos will contain enough additives to serve the engine the best way.
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Never used the oil additives. But was a long time user of diesel additive. Mainly to keep injectors clean and moss growth out of the tank. I never had any problems... Whether that was due to it working I can't be certain.
I have used diesel additives and biocides over the years. That is one terrible job trying to clean out black death algae from a fuel system.
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I’ve seen that video too—it’s well presented, but real-world results matter too. I used Tribotex in my high-mileage Accord just as a hail mary, and it genuinely made a difference. Quieter idle, smoother revs, and better oil pressure. I get the chemistry concerns, but in practice, it worked for me. Maybe it’s not for every engine, but I’m keeping it in my toolbox for older rides.