Bore wear, engine wear.

[Tony Griffiths]

There's a guy up the road who keeps a very expensive car in a lock-up next to my house, he's been through a string of different marques. Never drives them anywhere as far as I can tell, but diligently comes down every week or two, starts the engine and revs it in his garage for 5 minutes (presumably on full choke). Some day I will explain to him not only how irritating he is, but how much damage he is doing to his car; but he doesn't strike me as the listening type.

Reminds me of the 1970s in Derbyshire and a  local farmer who kept his Rover in a stone shed in the village. In winter his technique was identical; start the car and give it full revs in neutral for a good five or six minutes - it really was painful to listen to. Surprisingly, this 1950s Rover survived this treatment for at least five years - and goodness knows how long he'd been performing ths ritual before I moved in.