The Humble Oil Filter: What It Does, How It Works, and How Often You Should Change It

The oil filter may not be the most exciting component of your trusty automobile, but that doesn’t mean it’s not important. Quietly doing its appointed task without fanfare, the oil filter is absolutely critical not only to your vehicle’s current performance but also to the longevity you’ll enjoy when it is properly maintained. Your automobile’s oil filter is the first defense against fouling agents that could inhibit performance and shorten the service lifetime of your vehicle’s most critical system, the powertrain.

What is an oil filter, and how does it work? Why is it so important to inspect and routinely change your oil filter when getting an oil change near Monroe? Below, we’ll discuss everything you need to know about your car’s oil filter, and we’ll answer questions like how your oil filter works, how often it needs to be changed, and what could happen if you ignore your oil filter for too long.

What Is an Oil Filter?

The oil filter in your vehicle serves a vital function, protecting your engine from contaminants that can enter your oil over time. Fouling contaminants commonly found in oil include dirt, engine sludge, and even metal shavings that are peeled off the interior of your cylinder walls and pistons during the cold start of many engines.

Though your engine represents a system that is largely closed to outside contaminants, dust and grime can make their way into the closed-off system when the oil cap is removed for oil changes or refilling.

The oil itself is resilient to the rigors of your engine’s internal environment, but over time, it can burn and form sludge that clogs your engine’s critical components and reduces your vehicle’s efficiency.

Sludge and dirt don’t get fully removed from the engine with each oil change. Instead, the oil filter plays a crucial role by trapping contaminants from the oil that circulates through the engine, helping protect the engine from damage.

How Does an Oil Filter Work?

The oil filter in the average automobile represents a simple concept. Much like the kidneys in the human body, the oil filter traps contaminants as oil passes through it and prevents them from freely circulating and causing havoc in the engine’s internal ecosystem.

The filter consists of an external metal can that features a rubber seal at the threaded point of attachment. The filter can be screwed down flush with the engine’s oil filter assembly on the engine block to prevent leakage. Inside the metal can, there is a series of synthetic fiber filter materials. The engine’s oil pump moves the oil through the filter under pressure, and the synthetic element inside the can catches impurities in the oil and fixes them inside the filter.

Are There Different Types of Oil Filters?

Though oil filters are relatively simple in design and function, they come in two primary types.

Spin-On Filter

The first type is the most common, a tried-and-true spin-on canister filter that screws onto the threaded stem of the oil filter assembly on the engine block. Changing it is as simple as draining the oil and twisting the filter off using an oil filter wrench, taking care not to cross-thread the stem during removal.

Cartridge Filter

Modern vehicles are increasingly moving towards the cartridge filter, mostly because it provides enhanced environmental protection in newer cars. These filters consist of a housing that remains with the vehicle and a disposable filter element that is swapped out during oil changes.

Cartridge filters are increasing in popularity because they reduce vehicle weight and streamline replaceable materials, since only the filter elements need to be replaced instead of the element and housing.

How Often Should You Change Your Oil Filter?

The frequency of oil filter changes depends on several factors, including the type of filter you’ve chosen, the type of oil your vehicle uses, environmental conditions, and how often you change your oil. For example, if your engine routinely runs at higher temperatures for extended periods or you drive in dusty environments routinely, it could require more frequent oil and oil filter changes. Also, using synthetic oils provides higher contaminant-grabbing capability, which extends filter lifespan.

Typically, drivers should change the oil filter in their vehicles at routine oil change intervals, which can vary from every 3,000 miles to every 7,500 miles depending on the vehicle, driving conditions, and type of oil used. However, there are also synthetic long-life filters that are often paired with synthetic oil to extend the recommended oil change interval to 10,000 miles to 15,000 miles.

While some vehicle manufacturers recommend an oil filter swap every other oil change, the industry standard is to replace the oil filter at every oil change service to keep your vehicle in top working order.

What Are the Benefits of Routine Oil Filter Changes?

The benefits of regular oil filter changes greatly outweigh any cost associated with frequent filter changes, and proper maintenance of your engine will improve performance and extend service life.

Regular filter changes keep your oil cleaner, reducing the number of loose contaminants floating in your engine oil. That will result in greater fuel efficiency, less damage and wear over time, and enhanced performance.

Changing your oil filter routinely also extends the expected lifespan of your engine and its vital components. That translates to fewer required repairs and lower operational costs over the lifetime of your vehicle while ensuring that you’ll enjoy smooth, reliable performance under most driving conditions.

What Happens When You Don’t Change Your Oil Filter?

Conversely, when you don’t regularly change your oil filter, it can begin a downward spiral of issues that will ultimately lead to critical failures and a shorter service life for your vehicle.

Risks of Dirty Oil

Oil that is laden with dirt and contaminants severely degrades the capabilities of your engine. It leads to sludgy clogs that can dent fuel efficiency, decrease acceleration, and limit overall power. It can also lead to additional engine damage from poor lubrication and increased friction, issues that could easily be avoided with clean oil and a refreshed oil filter.

Strain on Your Engine

An old, clogged oil filter can put extra stress on your oil pump because more pressure is required to force the oil through a dirty filtration element. Unclean oil also leads to buildup that raises engine heat, magnifying wear on critical components and increasing the risk of failure.

Metal Shavings and Engine Wear

A clogged filter can’t effectively remove metal shavings from your engine oil, and those shavings will further increase friction and prematurely wear down your engine’s bearings, seals, and gaskets.

Risk of Skipping Oil Filter Changes

Given the low cost of routine oil filter changes, it only makes sense to adhere to the recommended maintenance interval specified by the manufacturer. Not only does a failure to heed the recommendations result in potential mechanical failure, but it may also void any manufacturer’s warranty you have on your vehicle, and that would be a costly mistake.

Changing the Oil Filter Is a Key Maintenance Step

Changing the oil filter on your automobile is a simple, cost-effective step that every driver can take to ensure their vehicle runs smoothly and efficiently while enjoying the maximum service life. By changing your oil filter at each recommended oil change interval, you can get the benefits of improved fuel efficiency, better acceleration and performance, and the peace of mind of knowing your vehicle is properly maintained and less likely to leave you stranded.

Neglecting regular oil filter changes can lead to serious mechanical problems that may cost thousands to fix and even potentially risk voiding your warranty. It’s best for your vehicle and for you to remain diligent about oil filter changes, because doing so will save you a great deal of time, money, and stress.