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EK - How car manufacturers are lying to us about oil changes

Written by Emils Karklins | Jul 23, 2025 7:41:46 AM

Buyer Persona: Cost-conscious car owners who care about longevity and value
Stage in the Buyer’s Journey: Consideration
Keywords: car maintenance, oil change,

Introduction: The Big Lie About Oil Changes

Car manufacturers have told us for decades that oil should be changed around every 10.000 miles or once a year. This sounds reasonable right? newer car, less hassle, lower maintenance costs, fewer trips to the mechanic etc.
Unfortunately, this is misleading advice and it could shorten the life of your engine and end up costing you thousands of dollars in repairs. In this post I will be talking about ways the car manufacturers are manipulating maintenance recommendations to sell more cars and more parts. But ultimately why changing your oil more often is the smartest move you could make.

The truth behind the lies

What is the main goal of car manufacturers? To sell more cars
They’re not primarily focused on keeping your car running for 300.000 miles, usually cars start to break right after the warranty of the car is over so if you have a second-hand car, you could be in trouble already. Car manufacturers usually want the car to last around 100,000-150,000 miles.

Why longer service intervals are of interest for the manufacturers

  • Lower maintenance: Longer service intervals mean less time at the workshop, less money spent and it seems like a win-win situation for both parts.
  • Warranty periods: Many car parts on the cars are meant to last the warranty period, and usually will start breaking when the warranty is over.
  • Leasing culture: People usually lease cars for around 2-3 years, so manufacturers cater to short-term ownership, knowing long-term problems won’t matter to them.
  • Regulations and marketing: Boasting about ‘’long-term intervals’’ helps them meet environmental marketing claims without full disclosure of consequences.

In reality engines are under more stress than ever — small engines are now fitted with bigger turbos that develop higher rpm, as well as bigger engines each year come with higher and higher horsepower. To ultimately outperform the previous model but the main components of the engine generally stay the same.

How Oil Really Works (and Why It Breaks Down Faster Than You Think)

Motor oil isn’t just a lubricant. It also:

  • Cleans contaminants and microscopic metal shavings out of your engine.
  • Cools internal components by dissipating heat.
  • Maintains a seal between piston rings and cylinder walls.

Over time, oil degrades. Heat, dirt, and combustion by-products make it less effective, turning it into sludge that can choke your engine.
Even synthetic oils — though better than conventional — cannot perform at their peak indefinitely.
Studies have shown that even at 5,000 miles, some modern oils already show significant viscosity breakdown and contamination.

What’s more, many drivers don’t realize that their “normal” driving actually qualifies as “severe” — with stop-and-go traffic, short trips, and extreme temperatures accelerating oil degradation.

How Often Should You Change Your Oil?

While your owner’s manual might say every 7,500–10,000 miles, most independent mechanics still recommend changing your oil every 3,000–5,000 miles, especially if you:

  • Drive in stop-and-go traffic (city driving).
  • Frequently tow or haul heavy loads.
  • Live in extreme climates (hot or cold).
  • Take short trips where the engine doesn’t fully warm up.

Even if you don’t drive much, oil still ages over time — so don’t wait more than 6 months, even if mileage is low.
One of the worst habits you can develop is assuming that “low mileage” means your oil is fine — oil oxidizes and absorbs moisture even while sitting.

The Hidden Costs of Skipping Oil Changes

Skipping regular oil changes can save you a few bucks now, but it’s like skipping dental cleanings: the damage accumulates invisibly until it becomes very expensive.

Here are some common consequences of infrequent oil changes:

  • Sludge buildup blocking oil passages.
  • Worn piston rings and bearings.
  • Blown head gaskets due to overheating.
  • Complete engine failure — which could cost thousands to replace.

And don’t forget the smaller costs: reduced fuel economy, poor performance, and higher emissions. Even resale value drops sharply when potential buyers see neglected maintenance records.

Why Frequent Oil Changes Are a Smart Investment

Think of an oil change as an insurance policy for your engine. For less than the cost of dinner out, you’re protecting one of your biggest investments — your car.
Benefits of regular oil changes include:

  • Longer engine life.
  • Lower repair bills over time.
  • Better gas mileage.
  • Higher resale value.
  • More confidence and peace of mind.

You’re not just changing oil — you’re extending the life of your car by thousands of miles and keeping your wallet happy.

Tips to Stay On Top of Oil Maintenance

It’s easy to take control of your car’s oil health with a few simple habits:

  • Mark your calendar or set a phone reminder for oil changes every 3,000–5,000 miles or 6 months.
  • Check your oil level and color monthly — dark, gritty oil needs to be replaced.
  • Use high-quality oil and filters; cheap parts can undo all your efforts.
  • Keep records of oil changes for warranty and resale value.
  • Find a trustworthy mechanic who won’t pressure you but gives honest recommendations.
  • Learn to check the oil yourself — a dipstick inspection takes 30 seconds.
  • If unsure, send a sample of your oil to a lab to check its condition.

Real-Life Story: The $8,000 Lesson

One driver shared his story: He faithfully followed the manufacturer’s 10,000-mile oil change advice. At just 95,000 miles, his engine seized from sludge buildup. The repair cost? Over $8,000 — more than the car’s value.


Had he spent an extra $200–300 a year on more frequent oil changes, he could have avoided the entire disaster.
This isn’t rare — mechanics see it all the time.

The Bottom Line: Don’t Let the Manufacturers Fool You

Car manufacturers don’t have your best interests at heart when it comes to maintenance schedules.
Their priority is to move vehicles off the lot and minimize warranty claims — not to keep your car running smoothly for decades.

By understanding the importance of regular oil changes and ignoring inflated interval claims, you can:

  • Extend your engine’s life.
  • Save thousands in repairs.
  • Maintain better fuel efficiency and performance.
  • Reduce harmful emissions caused by a struggling engine.
  • Enjoy a safer, more reliable car.

Changing your oil more often isn’t just maintenance — it’s taking control of your investment and your future.

Key Takeaways

  1. Don’t trust the manufacturer’s “long interval” claims blindly.

  2. Change your oil every 3,000–5,000 miles or at least every 6 months.

  3. If you drive under “severe” conditions (and you probably do), change it even sooner.

  4. Keep track of oil changes and don’t skimp on quality.

  5. Remember: cheap oil now saves thousands later.

 

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