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Warning: Skipping an Oil Change Can Be Harmful to Your Engine

skipping an oil change

“I didn’t have time to get it done before my trip.”

“I’ll do it next month.”

“I just forgot.”

These are a few of the many excuses drivers give for skipping an oil change. In some cases, no harm will come from exceeding the recommended oil change interval by a few hundred miles. But because fresh, clean motor oil is so vital to an engine’s longevity, drivers should be very careful to follow recommended schedules for oil changes and other services. In worse-case scenarios, dirty oil can cause serious and costly engine problems.

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This NAPA oil drain pan is a valuable tool for any DIY mechanic. It neatly collects your spent motor oil and seals tightly so you can transport it for recycling.

This is especially true for higher-mileage vehicles like my 2004 Subaru, which currently shows about 133,000 miles on the odometer. Most people know that motor oil is a lubricant that reduces friction between moving internal engine components. But there’s more to the stuff than just reducing friction. Oil also cools and cleans the engine. To do its job properly, motor oil must be effective in all three of these roles.

As oil gets old, it loses viscosity. That simply means it becomes thinner and runnier, reducing its ability to lubricate. It also becomes dirtier as tiny metal shavings worn away from components become suspended in the oil. Even if it retains some cooling properties, the dirty, low-viscosity oil stops effectively cleaning and lubricating internal engine parts.

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The oil pan drain plug for my car is located behind a plastic underbody panel.

Filled with tiny metal particles, dirty oil not only fails to do its job of lubricating and cleaning but causes further engine wear. From there, problems compound: oil becomes dirtier, causing more wear, and wear causes oil to become dirtier still.

So while exceeding your vehicle’s recommended oil change interval by a few miles is harmless, going too long without fresh oil and a new filter can cause serious engine damage.

Synthetic motor oil does not lose viscosity like conventional motor oil, so oil change intervals are typically longer for vehicle’s that use it. But synthetic oil still becomes dirtier over time. If your vehicle’s manufacturer recommends synthetic oil, do not substitute conventional oil.

skipping an oil change - NAPA Know How Blog_remove plug
After loosening the drain plug with a wrench, I remove it with my fingers and let it drop onto the drain pan’s built-in grate. With the grate, I don’t need to fish the plug out of the used motor oil.

Changing your own oil is easy. In most cases, you just need a few tools, motor oil and a new oil filter.

Oil Change Tools

Wrench for removing oil drain plug
Oil drain pan
Oil filter wrench

Oil Change Supplies

Motor oil (follow manufacturer’s recommendations for motor oil weight)
Oil filter
Drain plug washer

skipping an oil change - NAPA Know How Blog_oil filter
After coating the oil filter gasket with some fresh motor oil, I hand-tighten the new NAPA oil filter onto the spindle.

Changing the oil on my car takes about half an hour. Once completed, I simply returned the used oil to my local NAPA AUTO PARTS location for recycling. Never dump used motor oil as doing so is both illegal and harmful to the environment.

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The box for the NAPA filter includes a spot to record oil change information. My car calls for oil changes every 7500 miles. Considering the mileage, I change oil approximately every 5000 miles and NEVER skip an oil change.

Performing a DIY oil change isn’t for everyone. Maybe you don’t have the time, the space or even the interest in doing it yourself. If you prefer to leave oil changes to a professional, your local NAPA AutoCare Center can handle the job.

Nick Palermo View All

Nick Palermo is a freelance automotive writer and NAPA Know How blogger. Since becoming an auto news and reviews contributor at in 2011, he has broadened his coverage of the automotive industry to include topics like new car technology, antiques and classics, DIY maintenance and repair, industry news and motorsports. A committed advocate for automotive media professionals, Nick is a member of the Greater Atlanta Automotive Media Association.

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