In this specific case, it's a great example of how Google's attempts to keep people on Google has made search worse.

It's showing this result as a featured snippet because it's easy to distil into steps, and Google is hoping you'll just read the result and not leave Google.

The real 'no.1 result' is this much better article from a trusted UK-based motoring organization: https://www.rac.co.uk/drive/advice/car-maintenance/how-to-ch...

Of course, Google's attempts to stop you leaving, and hoover up as much of the ad market as possible, also drives publishers to ever more desperate things to make money.