Why do we still need dipsticks in cars?

The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific concepts
  
  

Everything but an oil level gauge ... classic Bugatti dashboard.
Everything but an oil level gauge ... classic Bugatti dashboard. Photograph: Martin Argles for the Guardian Photograph: Martin Argles/The Guardian

Why don’t cars have an oil level gauge on the dashboard, like the fuel gauge, instead of making me open the bonnet and peer at an oily dipstick?

Simon Harrison

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