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Update To respond to earier questions.. No it does not rattle when idling - it's a tappit like sound while demanding power from the engine (not on overrun) and only when engine is cold - pretty well until the blue light extinguishes to indicate engine temp OK

Initial reactions I don't buy the antifreeze suggestion - car is fully protected and the noise goes away once engine is warm. I double checked the registration docs - engine is 1240cc model is "Micra S Auto" - owners handbook implies the engine is of type CR12DE, if that helps. The symptoms...

If left out overnight in cold winter weather the engine rattles when started - sound much like tappets used to sound in the olden days. The noise continues for about the first mile or two and is more noticeable under power. Am wondering if there is a restriction in an oil way and thus taking...