Bought a New Car? How to Avoid Misfuelling in the First Week

The New Car Risk Window

Misfuelling risk peaks when drivers transition to a new vehicle — particularly when moving from petrol to diesel or vice versa. Muscle memory from years of fuelling a petrol car does not update automatically when you collect a new diesel SUV. The forecourt habits built over years — reaching automatically for a particular nozzle colour, not reading the label — become a liability.

The First Three Fills Are the Most Dangerous

Industry data consistently shows that the first three refuelling sessions in a new vehicle are when misfuelling is most likely. Cognitive load is high — you are still learning the car's systems, controls, and quirks — and fuelling becomes something done in parallel rather than as a focused task. Give yourself permission to take ten seconds at the pump, every time, until the new fuel type is fully habitual.

One Habit That Works

Set a phone reminder that fires every time you approach a petrol station for the first month: "Check fuel type before nozzle." It sounds excessive, but habits take approximately 66 repetitions to become automatic. A thirty-day reminder protects you through the highest-risk window and costs nothing. The alternative costs potentially thousands.