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.
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.
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.
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:
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.
A dishwasher tablet in your bathwater will clean your skin, but would you risk it?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,
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 detergent is the bestPerfect for diesels then!
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.
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.
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.