Looking at buying an fn2 with 128k miles, this would be my 2nd. The owner says there is a rattle that sometimes happens when the car is started, this then goes after about 15-20 seconds, it doesn't always happen though. The car seems in good overall condition, full history, no loss of power and pulls hard, no engine management light on, any ideas what it could be? He thinks it may be the timing chain, from what I've researched it could be this or maybe valve clearances?
Thanks