I am Danish
Thank you for the answer. Could you elaborate a bit? I am not being stupid on purpose, I'd just like to know what will happen if I DON'T change it.
The chain will progressively wear other components, crank and cam pulleys. Stretched chain is longer so the spacing of its openings is further apart and don't fit properly on the teeth of the pulleys. Imagine a bike with a chain of hole spacing 12mm trying to run on a pulley with tooth spacing of 10mm. That is the rattle. Chain is not loose, the tensioner does its job but chain does not fit any-more on the pulleys properly. The teeth will progressively wear out and cause the chain to fall off or snap.
If you delay the replacement, you will not be replacing only the chain, but also the pulleys and the cam pulley have cam variators integrated in them and are pretty expensive.
As I have understood, the main reason for chain stretching is insufficient cooling. There is only one oil noozle that sprays oil on chain thus lubricating and cooling it. With overoptimistic oil change intervals it gets clogged by carbon and the chain runs dry - metal overheats and stretches. Frequent oil changes are vital for 2,2 JTS and Alfa recommendation of oil change intervals is really just a joke.
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