Why it worked
The video uses clear, high-contrast visual feedback (red X vs. green check) to solve a common, high-stakes problem for car owners, making the content instantly useful and shareable.
Product placement
AUTODOC (a) acts: the video is branded with the AUTODOC logo and the creator handle is @autodoc.eu, which is the company's online shop for car parts. The video demonstrates a car maintenance task, which is the core service of the brand. Removing the branding would change the source and context of the advice, but the tool itself is not a specific product being sold, rather the brand is the subject.