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Okay so I read a lot about the problems with the chain.
I noticed that the chain is sometimes not tight, this is sometimes cold or if you turn off the engine. I read that people say this is normal cam shaft turns etc ..
I have ordered a new tensioner and tested it with oil, the old one does not remain on tension like the new one. The difference is not really big but certainly present.
I also see people saying that the two upper pieces are broken, that small piece where they click into each other at the top is only practical for assembly, it is fixed everywhere with bolts so it doesn't matter.
So if you have a bad tensioner and the car starts every time with a little slack in the chain, I don't think it's good for the whole chain.
After replacing, I always have a tight chain.
I am from the Netherlands and drive a 2012-12 model year 2013 328xi n26 93000km
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