Oil Changes: One of the Most Important Routine Car Maintenance Jobs

You don’t see it working.

You probably don’t think about it while driving.

But while your engine is running, motor oil does one of the most important jobs under the hood.

It lubricates moving engine parts, helps control heat, carries contaminants, and helps protect components from premature wear.

Eventually, however, that oil needs to be changed.

An oil change is one of the most familiar vehicle maintenance jobs, but drivers can still have questions about when to do it, which oil to use and why it matters.

The good news is that you don’t need to become an engine expert.

Your vehicle manufacturer has already provided most of the answers.

What Happens During An Oil Change?

The basic idea is simple.

Mechanics drain the old engine oil and replace it with fresh oil that meets the vehicle’s specifications.

The oil filter is generally replaced at the same time.

As an engine operates, its oil is exposed to heat and contaminants. Over time, the oil and its additives can become less effective at doing the jobs they were designed for.

Changing the oil gives the engine a fresh supply of lubricant and removes old oil and suspended contaminants.

It may sound like a small maintenance job.

Inside an engine, however, lubrication is a very big deal.

Why Does An Engine Need Oil?

An engine contains many moving components.

Without proper lubrication, friction between those parts would increase wear and generate additional heat.

Motor oil creates a lubricating film that helps those components move while reducing friction and wear.

Oil also helps carry heat away from engine components.

Modern motor oils also perform additional jobs, including keeping deposits and contaminants under control.

That’s why neglecting oil changes can eventually become expensive.

You don’t replace engine oil only when the car starts running badly.

It is preventive maintenance intended to help keep that from happening.

Not All Motor Oil Is The Same

Walk into an auto parts store, and the motor oil aisle can be confusing.

There are different brands.

Different viscosity grades.

Conventional and synthetic products.

And containers covered with numbers, letters, and specifications.

The most important thing isn’t choosing the bottle with the most impressive claims on the label.

It’s choosing an oil that meets your engine’s requirements.

Some vehicles require particular viscosity grades and oil specifications. Using the wrong product means the oil may not provide the protection the engine was designed to receive.

Your owner’s manual should identify the appropriate oil.

A qualified mechanic can also help you choose the right product.

Synthetic oils are common in modern vehicles and can offer performance and protection advantages under certain operating conditions, but that doesn’t mean drivers should choose an oil simply because it is labeled synthetic.

The manufacturer’s specification should come first.

How Often Should You Change It?

This is where old advice can cause confusion.

For years, many drivers were taught to change their oil according to a simple mileage rule.

Modern vehicles don’t all follow the same schedule.

The right interval depends on the vehicle, engine, oil specification, and driving conditions.

Some vehicles also have oil-life monitoring systems that calculate when service is due based on how you use the vehicle.

That’s why the best answer to “How often should I change my oil?” is found in the maintenance schedule for the vehicle you’re actually driving.

Check the owner’s manual.

If your vehicle has an oil-life monitor, learn how it works and follow the manufacturer’s instructions.

Certain operating conditions may also affect maintenance recommendations. Frequent short trips, heavy towing or other demanding use can place different stresses on a vehicle than ordinary highway driving.

Don’t assume the schedule that worked for your last car is automatically correct for your current one.

Don’t Ignore The Oil Level

Changing the oil on schedule is only part of the job.

Drivers should also make sure the engine has the proper amount of oil between changes.

Some engines consume oil during normal operation. Others can develop leaks.

That means an engine can become low on oil before the next scheduled service.

If your vehicle has a traditional dipstick, the owner’s manual will explain how and when to check the oil level properly.

Some newer vehicles use electronic oil-level monitoring instead.

Also pay attention to dashboard warnings.

An oil-pressure warning is especially important and shouldn’t be treated as a simple reminder that an oil change is due. Loss of oil pressure can threaten the engine and may require immediate attention.

If you’re unsure what a warning light means, check the owner’s manual rather than guessing.

Keep A Record

Oil changes are easy to remember immediately after they’re done.

Six months later, maybe not.

Keep a record of the date and mileage each time you change the oil.

Many repair shops provide a sticker showing when the next service may be due, and some vehicles keep maintenance information electronically.

Records can also help a mechanic understand the vehicle’s maintenance history and can be useful when you sell or trade the car.

Most importantly, keeping track prevents the familiar conversation:

“Didn’t we just change the oil?”

“Wasn’t that last year?”

“I thought you took it in.”

Routine maintenance works only when somebody remembers to do it.

A Small Job With A Big Purpose

An oil change isn’t exciting.

It doesn’t make the car look different.

You won’t get a new feature to play with.

And when the job is done correctly, you may notice no difference at all when you drive away.

That’s the point.

Preventive maintenance helps everything keep working the way it should.

Whether you change the oil yourself or a professional mechanic handles the job, use the correct oil and filter and follow the maintenance schedule for your vehicle.

A few minutes spent checking the owner’s manual can answer the two questions that matter most:

What oil does my engine need?

And when does it need to be changed?

Your engine may never thank you.

But avoiding unnecessary wear is a pretty good substitute.