I must confess to renting a new 997 Cab in 2005 with 75 km on the clock. I drove it gently for an hour on the way to the Nordschleife then drove it at race speed on the track for a few days. The car was humming very happily when I returned it a week later.

My own cars get a slightly longer break-in period - about 1000 km is sufficient before taking a car to the track. I have that info straight from God, so it must be right