I am due to close on a 2008 Mini Cooper S, that is very clean, premium appointed and well cared for. It has 42k on it, and I had it checked out by a mechanic that works on Minis. A reasonable price and I'm planning on getting an extended warranty. But something in my gut says "beware of the rattle" So I have a few questions. 1)Is there a certain extended warranty that would cover this defect if it arises 2)Can the timing chain tensioner be preemptively replaced to avoid this problem to begin with? 3)Should I just avoid this problem all together and buy a newer model, a lastly 4)Which S models do not have this problem. According to Consumer Reports, reliability got better as of 2011.