I don’t know how the Mercedes ones work or what type of fridge he has, but BMWs just have a door light and a filter goes over it for “M”, “BMW”, the roundel, etc., and my fridge just has a light.

I assumed he found you could put the filter from the car on the fridge light with a minimum of fucking around.

But you’re right, the more time and effort spent on this, the stupider it becomes.