Popular Car Maintenance Tasks Done at Home Statistics and Trends (2026)

Doing car maintenance at home is still common in the U.S., but the reasons are changing. Vehicles are older, parts buying habits are shifting online, and many repairs now require more tools and scan data than they did a decade ago. This report pulls together the most reliable recent industry figures available to show what American DIY maintenance looks like heading into 2026, which tasks people still do themselves, and what the trends mean for owners and the aftermarket.

Key Statistics at a Glance

Most Important Findings

• DIY remains a meaningful slice of a very large market: A 21% DIY share sounds small until you place it inside a U.S. aftermarket projected at about $617 billion in 2026. Even a minority share represents a massive number of at-home service events and parts purchases.
• DIY is stronger in parts volume than in service dollars: DIY buyers represent about 25% to 30% of parts purchases by volume, but professionals capture more of the total spend. That gap signals a “simple jobs at home, complex jobs at the shop” split.
• America’s aging car fleet supports DIY activity: With an average vehicle age of 12.6 years in 2024, many owners are keeping cars long after warranty. Older vehicles generally drive more maintenance decisions, including which jobs people feel comfortable doing at home.
• Oil changes still define DIY for many households: About 25% of owners changing their own oil at least once per year shows the classic DIY maintenance task remains a primary entry point.

Industry Overview: How Big Is DIY Maintenance in 2026?

The Auto Care Association projects the U.S. light-duty aftermarket at roughly $617 billion in end-user sales in 2026. That number covers parts and service spending across the vehicle fleet, from routine maintenance to major repair.

Within that total, DIY is projected to represent about 21% of the consumer service market. In simple terms: Most service work still happens in professional bays, but a meaningful share still happens in driveways, garages, and apartment parking lots.

What “21% DIY” really means

A 21% share does not mean one in five repairs are DIY. It specifically points to the consumer service market segmentation used by aftermarket research: DIY (Do-It-Yourself) versus DIFM (Do-It-For-Me). DIY tends to cluster around maintenance and lighter repairs, while DIFM captures more labor-intensive work and jobs requiring advanced diagnostics.

Practical implication for vehicle owners: DIY remains normal for certain tasks, but the average modern vehicle is pushing more people toward shops for anything involving calibration, ADAS sensors, complex electronics, or tightly packaged engines.

Practical implication for the industry: Retailers and parts brands still need strong DIY support, but growth often comes from products that make DIY easier (kits, packaged fluids, fitment tools), and from “assisted DIY” where shoppers buy parts but rely on professional installation.

DIY vs. DIFM: The Volume-Dollar Split Explains the Trend

Auto Care Association data shows DIY consumers account for about 25% to 30% of aftermarket parts purchases by volume (2024). At the same time, DIFM dominates by dollar value.

What it means

This pattern is common in the aftermarket: DIY buyers purchase a lot of items that are relatively low-cost per job (filters, wiper blades, fluids, bulbs, basic ignition parts). DIFM captures high-dollar jobs with more labor time, specialized tools, and higher shop rates.

Why it matters

When DIY holds a larger share by volume than by dollars, it suggests the typical DIY job is “small but frequent.” It also suggests that many owners may still shop for parts themselves even if they do not install them. That behavior affects:

• Parts retail and e-commerce: Fitment accuracy and clear packaging become the difference between a quick driveway job and a return.
• Repair shop workflows: Shops increasingly deal with customer-supplied parts, especially for maintenance items.
• Owner decision-making: Many people mix DIY and DIFM, choosing DIY for the jobs they can control and outsourcing the rest.

For a broader view of how DIY can change costs by job category, see CarReformer’s related research on savings by job type.

Market Trends: Older Vehicles Keep DIY Relevant

S&P Global Mobility reported the average age of light vehicles on U.S. roads reached 12.6 years in 2024, up from 11.9 years in 2019. That is a meaningful change over five years, and it matters for DIY because vehicle age strongly influences how people maintain and repair cars.

What the increase in average age means

As the fleet gets older, more vehicles sit in the “out of warranty” zone. Once a vehicle is out of warranty, owners tend to compare the cost of professional service versus the value of the car more directly. That is when DIY maintenance often becomes more attractive, especially for owners who want to keep an older car running without taking on a new payment.

Why it matters to DIY task popularity

Older vehicles are more likely to need routine items (fluids, filters, belts, hoses) and basic wear items. Many of these are doable at home, especially when the job does not require complex calibrations or programming. In other words, an aging fleet supports steady demand for classic DIY tasks even if newer cars are harder to service.

Practical implications for owners and the aftermarket

• Owners: Older cars can be more DIY-friendly in some areas (simpler electronics), but they can also have corrosion and stuck fasteners that raise the difficulty of even “simple” jobs.
• Parts makers and retailers: Demand tends to rise for maintenance parts that match high-mileage vehicles, including filters, fluids, ignition service parts, and gasket-related items.
• Service providers: Shops may see more diagnostics and “fix the symptom” visits as owners try to stretch vehicles longer.

This is also why used-car shoppers benefit from basic history checks. Problems like mileage misrepresentation can change a maintenance plan overnight. CarReformer’s Beginner guide to odometer fraud explains what to look for.

Consumer Behavior Statistics: Which Maintenance Tasks Are Most Often Done at Home?

DIY includes many different activities, from quick checks to full repairs. But one job still stands out as the most common: the oil change.

DIY oil changes remain the top at-home task

IMR Inc. Automotive reports that oil and filter changes are the most frequently performed DIY maintenance task, with about 25% of U.S. vehicle owners changing their own oil at least once per year.

What this statistic means

One in four owners doing at least one oil change per year is a strong participation rate for a hands-on job that requires lifting the vehicle (in many cases), buying the correct oil specification, and handling used oil responsibly. It also shows that, even with the growth of quick-lube chains and dealer service specials, a large group still chooses to do this job at home.

Why it matters

• Oil changes are a gateway behavior: People who do their own oil changes are more likely to do other simple maintenance tasks over time, like air filters or wipers.
• Oil choice and spec compliance matter more now: Modern engines often require specific viscosities and manufacturer standards. A DIY oil change is simple, but the “right oil” question is more complex than it used to be.
• Maintenance affects diagnosis: Skipped oil changes and wrong oil can contribute to noise and wear complaints that later look like bigger failures.

For owners chasing an unusual engine sound, it can help to separate normal noise from a warning sign. CarReformer’s explainer on engine knocking noise at idle covers common causes and what they typically point to.

What the Data Shows About DIY in 2026

Even with only a few high-authority statistics, the direction is clear.

DIY stays steady because the fleet is older, not because cars are simpler

The 12.6-year average vehicle age supports a steady pool of DIY-friendly vehicles. But the same market is also full of newer vehicles where DIY becomes harder due to packaging, electronics, and software dependencies. That tension helps explain why DIY can remain important without growing into a majority of service activity.

DIY is still big in “unit volume” behavior

The 25% to 30% DIY share of parts purchases by volume signals that millions of small maintenance decisions still happen at home. This is the practical reality behind the 21% DIY service share. Many owners may not replace a transmission at home, but they will still buy filters, fluids, and basic parts and do smaller jobs.

Oil changes still anchor DIY habits

The IMR finding that about 25% of owners do at least one DIY oil change each year matters because oil service touches the heart of vehicle reliability: lubrication, wear control, and engine life. In most households, doing oil changes correlates with a more proactive approach to maintenance overall.

Key Insights for Vehicle Owners and the Aftermarket

For car owners: DIY is best viewed as a “maintenance mix,” not a lifestyle label

The data supports a mixed pattern: Many owners do some tasks at home, then use a shop for bigger work. For beginners, this matters because you do not need to “go full DIY” to benefit from it. A few common jobs each year often deliver most of the practical value of DIY: control over schedules, parts selection, and inspection opportunities.

Related note: Some DIY activity is not about repairs at all, but cleanliness and inspection. That can still influence long-term durability, especially in harsh climates. CarReformer’s guide to engine bay cleaning at home shows what owners typically focus on when they want a simple DIY project tied to inspection.

For retailers and brands: Fitment clarity drives DIY success

When DIY represents 25% to 30% of parts volume, the “small mistakes” become a big issue at scale. Wrong oil specs, incorrect filter sizes, or poor application data can turn DIY shoppers into return shoppers. The practical takeaway is that product data quality and packaging clarity matter as much as price in the DIY segment.

For repair shops: DIY behavior still influences your bay

Even when a shop does most labor, DIY behavior changes what arrives at the counter. Customers may show up with a part they bought (sometimes the wrong one), or they may come in after a DIY attempt with a new symptom. Understanding the most common DIY tasks, especially oil changes, helps shops anticipate common follow-up issues like stripped drain plugs, incorrect oil levels, or leaks from mismatched filters.

As vehicles age, owners also show up with drivability complaints that have multiple possible causes. When a car stalls intermittently, for example, the root cause can range from fuel delivery to sensor issues. CarReformer’s overview of engine shuts off while driving is a helpful reference point for how these complaints are commonly framed.

Key Takeaways

• The 2026 U.S. aftermarket is projected at about $617 billion, and DIY remains meaningful: Auto Care Association data places DIY at roughly 21% of the consumer service market, showing at-home maintenance is still a major part of the ecosystem.
• DIY punches above its weight in parts volume: DIY accounts for about 25% to 30% of parts purchases by volume, even though DIFM leads by dollar value. This points to many smaller, more frequent at-home jobs.
• The vehicle fleet is older than ever, which supports DIY: The average U.S. light vehicle reached 12.6 years old in 2024, up from 11.9 in 2019. Out-of-warranty ownership is a key reason DIY stays relevant.
• Oil changes remain the most common DIY maintenance task: IMR Inc. data indicates about 25% of owners do at least one DIY oil and filter change per year, making it the clearest indicator of ongoing DIY maintenance behavior.
• The practical 2026 picture is a split market: Many owners still handle basic maintenance at home, while complex and high-dollar repairs continue shifting toward professional service due to vehicle complexity and tooling needs.