Owner's book · not a shop
Know the car. Then the window. Factory specs in plain English — don't authorize until you can say this at the counter.
Playbooks
Beginner · short stepsExpert · spec · code · mm
Pick the situation. Read the left column. Say that at the window.
Twelve owner scenarios. Beginner script + genius measurements. SaferCar patterns — not a pirated TSB book.
Playbooks · Oil · Daily owner
The cap beats a heuristic
If the bay missed the catalog, the card is a guess labeled HEURISTIC — not Motor, not OEM TIS. Walk to the cap. 0W-20 on a 2013 Accord is not 5W-20 on a 2004.
A lube shop already has the drain plug out. They asked “conventional or synthetic?” You need viscosity and spec, not a brand pitch.
Beginner steps
0 / 4 beginner steps
Do not
Expert notes
Heuristic miss
If the spec sheet is stamped HEURISTIC, we do not have this YMM in the JSON book. That is not Motor. That is not OEM TIS. Do not pour from the guess.
0W-16
Toyota Dynamic Force caps often say 0W-16. 0W-20 is an emergency fill on some years, not the spec. The cap still wins.
Open a live desk
SaferCar buckets this card answers: engine · not CR
Related patterns
Common failures by symptom. SaferCar pointers — not pirated TSB PDFs.
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