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Billfitz - I do agree. Hopefully the new tensioner will prevent future issues.
I also have an E90 with the N43 engine (I don't think it was an engine available in the US) which also has a tendency to have timing chain guide issues. I replaced the tensioner on that car a few years ago (just swapped it over) and I've had no timing chain issues to date, now at 102k miles. I hoped the N20 would be the same simple tensioner swap.
I was really aiming the advice at DIYers with limited knowledge or experience thinking it was an easy job with no risk. I followed a DIY that someone had posted here somewhere (a PDF), but obviously it turned into a bigger job as a result.
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