'Mechanics Lie To You:' Mechanic Says Most Cars Can Last 300,000 Miles. Then He Reveals The $8 Part That Makes It Possible

Many auto enthusiasts view high mileage as a badge of honor. To them, it signifies responsible car ownership, which often entails carefully performing routine maintenance and generally taking good care of the vehicle.

But what if the trick to hitting that 300,000-mile mark is as simple as an $8 part? One car expert says that's all it takes.

A TikTok creator that appears to be dedicated to sharing videos from elsewhere on the web recently reposted a video captioned, “Mechanics LIE to you: The $8 Part That Destroys Your Entire Engine.” The clip comes from a 12-minute YouTube video posted by Car Care Crew Reviews.

In Car Care Crew Reviews' post, the narrator says, “Over 60% of cars that hit 100,000 miles are dead within the next 30,000. Not because the engine gave up, but because the owner never knew what to do next. Dealerships won’t tell you this.”

What $8 Part Guarantees Vehicle Longevity?

“Shops stay quiet because your ignorance pays their bills,” the narrator says. “Today, we’re exposing the 10 things mechanics quietly do to their own cars at 100,000, but never put on your invoice. Stick around for No. 1, because it costs less than a tank of gas and it’s the single biggest reason some cars hit 300,000 miles while yours is already falling apart.”

The clip focuses on two components: The cabin air filter and the battery and charging system.

The narrator calls the cabin air filter the “$10 part that is silently killing your AC system,” noting that forgetting to replace it for long periods can strain your system.

The other part of the list highlighted in the clip addresses how a faulty alternator can drain the battery and require multiple replacements. That’s why it’s important to check the alternator when dealing with persistent battery issues.

How Much Does A Cabin Air Filter Cost?

According to JD Power, the cabin air filter not only keeps the air circulating through the vehicle clean, but it also helps prevent debris buildup that can cause blockages over time. Regarding cost, it can run car owners $20-$50 for the service, but certain vehicles—especially luxury brands—require filters that can cost upwards of $100 to replace.

Of course, the DIY-minded car owner might find that the job is easy enough in most vehicles that they don’t need to go to a shop. That’s because the part itself generally ranges in price from $10 to $30. Commenters on this Reddit thread attest to how quick and easy the process can be.

Viewers React To Cabin Filter-Longevity Claim

In the video's comments section, viewers expressed skepticism about the claim that replacing the cabin filter will improve a vehicle's longevity.

“My cabin air filter was $18,” said one person.

“The cabin air filter should be replaced each 30,000 kilometers when the oil and oil filter are replaced,” a second person said.

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“I’ve had [a cabin air filter in my vehicle] for six years now and I’m still on the original motor,” a third person said.

Motor1 reached out to Car Care Crew Reviews via email for comment. We'll update this if they respond.

Most Cars Die After 100K Miles — Here’s Exactly Why Yours Doesn’t Have To.

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