[pothole]

I am sceptical about this vario-cam transition thing being the problem some say.

The vast, vast, vast majority of these cars have been bought and run by non enthusiasts who just wanted a fancy looking car with a Porsche badge and a roof that dropped. I would bet most of them drive around nearly all the time in exactly the rev range that is meant to be problematical.

If it really caused problems, they'd be utterly rife. But they're not. So I surmise it's not something to worry about.