BMW Z4 09 model Engine rattle knock starting from cold

[stevetaz]

I have a sdrive 3.0 October 2009 and it’s done about 5k mikes. I notices the knocking noise from the engine about 3 months ago and notices it went when the car had done about 2 miles. I booked it in to our local dealer and they had it overnight they found nothing wrong. When I went to collect it they said if it comes back to let them know, i went out to the car and started it and it was knocking got the service guy out and the technician who had worked on the car and they both heard it. They both said it should not be doing this. I rebooked it in but had to wait two weeks, dropped it off and said i would leave it with them for a week to see if they could find the problem, They have had my car now for two weeks and they said it has not been knocking when they start it. The original technician was on holiday for those two weeks he is back today so the chief technician and the service manager were going to speak to him. I spoke to the service manager today and he said there was nothing wrong with the car. I did a bit of searching on the tinternet and found all the you tube recordings and emailed him the links on z4 that have the knock

Has anyone come across this problem and have an answer some people seem to think it’s the lifters ?
I have a 39 year old landrover that quieter then this z4 when it starts !