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.”

“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.”