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I don’t think there is a major need to second guess the tensioner. From what I’ve read here, you will know when/if it starts slipping, the dreaded tractor rattle on start up.
Once this starts, that’s the time to look to replace the lot. The new parts are an updated version, so in theory, that will be the first and last time they need replacing.
The phase II RCZ’s 2013 onwards (facelift models) had the updated parts fitted from new, and there have been very few cases of their tensioner failing.
If it ain’t broke don’t fix it! But if your car hasn’t had a chain and tensioner kit then it will need one eventually when? Who knows but most MK1 cars needed replacement pretty early mine at 17K but I’ve heard of cars under 10k having to be replaced! And as for MK 2 cars I know of one R owner who have had two chains replaced under warranty.
The key is to use the best quality 0-30w oil and keep the level on max.