I looked at a 540i yesterday, bit of shed and sounded like the timing chain was rattling, not terrible but you could hear it from in the car with the door open.
My question is how much noise should there be on a 540i or 535i with over 100k miles all things being equal!?
I would maybe expect some slight whirring as it spins but I would have thought if it was making a slight clattering noise it's loose, the car was pre vanos and it was drivers side!
So anyway how much noise is o.k?
Thanks in advance