I have bought Micra in October last year. Now it is on 30000km and it recently started knocking/rattling as if it had bad timing chain tensioner. At the first time I thought that it is a hole on the exhaust pipe somewhere. I am using 94 gas, synthetic oil and Duralube additive. I have always warmed up the engine until idle rpms drop below 1000. The noise is louder on cold engine, it comes from the side opposite to battery (passenger side). The next oil change/service comes on 33000km (the $325.00 "long list" inspection). I will update on the result (will complain about the noise).