I made a point of popping the bonnet on my C55 and showing that the engine was stone cold before I started it, in front of the chap who had come to look at it.
Indeed. If the engine is warm when you go to inspect the car it either means the seller is a fucktard or they have something to hide. Plumes of blue smoke on a cold start up in my case, due to shot valve stem seals.
I made a point of popping the bonnet on my C55 and showing that the engine was stone cold before I started it, in front of the chap who had come to look at it.