This is bizarre as mine did the same yesterday. It had been parked on a really steep slope (about 30 degree nose down) and lasted about a second. I checked the oil straight away and it was still on max so no problems there and no sign of it either. Went to Rockingham in it today for the touring cars and no a whisper, drove well all the way.
I just put it down to being parked on such a steep slope for a day or so. It had an oil change about 2k ago and Benny himself did my chain about 6 months ago so im sure its fine, just a one off thing 🙂