Written for people who check the work.

The Engine Vault comes from Gus Kowalski, a YouTube channel about the mistakes, myths and shop tricks that cost car owners money.

A ten-minute video can tell you what to watch out for. It cannot hand you the torque range, the checklist or the fair-price table at the moment you need them.

These books are that reference layer: tables, checklists, worksheets and calendars you can print, take to the counter and check against.

The goal isn't to make you a mechanic. It's to make sure nobody can talk you into paying for work you can't verify.

These books are general education, not professional, legal or insurance advice. Fuel, electrical, jacking and hot-coolant work carry real risks; the books say where a qualified mechanic takes over. Specifications vary by model and year: always confirm against your owner's manual or service information. Cost figures are worked estimates at the rates stated in the text, not quotes. Gumroad handles payment and refunds.