Oil Change Myths That Could Cost You a New Engine

Changing your oil seems like one of the simplest aspects of vehicle maintenance—so simple that it's often misunderstood or brushed off. However, believing the wrong information about oil changes can lead to engine damage, performance issues, and unexpected repair bills. With so much conflicting advice out there, it’s easy to fall for myths that do more harm than good.

Let’s clear up the most common oil change myths and explain why sticking to proper oil service matters more than ever.

Myth #1: You Need to Change Your Oil Every 3,000 Miles

This myth has been around for decades, but modern engines and high-quality synthetic oils have changed the game. Most newer vehicles can safely go 5,000 to 7,500 miles between oil changes—and some even longer, depending on driving conditions and oil type.

However, this doesn’t mean you should push it too far. If you drive in severe conditions—like frequent short trips, stop-and-go traffic, or extreme temperatures—you may still need more frequent changes. Always follow the manufacturer’s recommendation in your owner's manual, not outdated general advice.

Myth #2: If the Oil Still Looks Clean, You Don’t Need to Change It

It’s tempting to check the dipstick and assume that clean-looking oil means it’s still good. However, oil can lose its protective properties long before it changes color. Over time, oil breaks down and becomes less effective at lubricating, cooling, and cleaning your engine—even if it looks okay.

Additives in modern oils help keep contaminants suspended and prevent sludge buildup, so clean-looking oil isn’t necessarily fresh oil. Judging oil health by appearance alone is a risky shortcut.

Myth #3: Synthetic Oil Will Ruin Older Engines

There’s a long-standing myth that synthetic oil is “too slippery” for older engines and will cause leaks. In truth, high-quality synthetic oil is safe for most older vehicles, as long as the engine is in good shape and doesn’t already have major gasket issues.

Synthetic oil often offers better protection, cleaner operation, and improved performance over conventional oil. If you’re switching for the first time in a high-mileage car, some drivers opt for a synthetic blend to ease the transition, but in most cases, a full synthetic is perfectly fine—and sometimes better.

Myth #4: Topping Off Is Just as Good as an Oil Change

If your oil level is low, topping it off might solve the immediate issue—but it’s not a substitute for a full oil change. When you top it off, you’re mixing fresh oil with old, dirty oil that has already degraded. That leftover oil still contains contaminants, acids, and particles that reduce your engine’s protection.

Over time, relying on topping off instead of draining and replacing the oil can lead to sludge buildup and accelerated engine wear. You should always address why the oil is low in the first place, not just keep topping it off and hoping for the best.

Myth #5: You Can Ignore the Oil Light Until You Have Time

The oil pressure warning light isn’t just a gentle reminder—it’s a serious alert. If this light comes on, it usually means the engine has lost oil pressure, which can lead to catastrophic damage within seconds.

Driving with low oil pressure risks seizing the engine and turning a minor maintenance task into a full engine replacement. If your oil light comes on, shut the engine off as soon as it's safe and check the oil level. If it’s full, there may be a pressure or sensor issue—but either way, it needs immediate attention.

Consistency and Quality

No matter what kind of car you drive, the key to engine health is regular, high-quality oil changes. Sticking to a realistic schedule based on your vehicle’s needs, driving habits, and the type of oil used will help prevent major issues down the road.

Cheap oil and infrequent changes might save a few bucks in the short term, but they often lead to expensive repairs like worn piston rings, valve damage, or failed timing components. Engine oil is your vehicle’s lifeblood—treat it accordingly.

JP’s Garage – Oil Changes Done Right in Dieppe, NB

Not sure if you’re overdue for an oil change or wondering what type of oil is best for your car? JP’s Garage in Dieppe, NB, is here to help. Our team will check your oil condition, guide you through service intervals, and use only top-quality oil and filters to protect your engine.