I have never run anything in just driven normally but I always warm the car/bike up before going beyond 50% revs. However I am carefull with brakes and clutches and not hard on tyres (cornering) until its done 100 miles +. Also never had any problems with the engine on the Golf GTI's I have had (6 in total and 3 from new). Dealer says the same, but personal choice so I wouldnt worry about it.