My skim reading skills have deteriorated horribly.
My skim reading skills have deteriorated horribly.
Time to get back to college?
He's probably thinking of car instrumentation, such as oil pressure gauges, fuel gauges, etc. Those, I believe, can become less accurate over time, but not enough to really make a difference unless it fails entirely.
Explain to him that a metal stick tends to not degrade quickly.
however, when dealing with inaccurate readings, your best course of action is to aim for the middle and regularly re-check. Without knowing the direction of the inaccuracy or its jitter you risk under- or overfilling otherwise.
If it rusted away at the bottom I suggest an oil change.
If it is rusting away he has bigger problems.