When was the last time you saw a car emitting large clouds of oil smoke? Unless you’ve just been driving something classic, multi-cylindered and Italian, I’ll bet it’s been many months.

It’s all because of the improvements made to lubricants, or so an engineer friend tells me. “Life has changed completely,” he says, “my old man would never drive his old MGB to the West Country without a spare set of piston rings tucked into a corner of the boot. Today you’d never think of it.”

One reason for the improvement is that materials have improved, says my friend, but mostly it’s down to those modern lubricants. Engines just don’t wear out any more.

What set me thinking about this was a visit to the National Motor Museum at Beaulieu yesterday, where for the first time in 20 years they started the 1920 350-horsepower Sunbeam in which Sir Malcolm Campbell set several land speed records, finally pushing through the elusive 150mph barrier at Pendine Sands in 1925.