I would buy OEM from fcpeuro. I recently helped somebody replace their chain tensioner when the chain was rattling at start and before it killed the chain guides.
We bought two different tensioners and wow were they totally different designs. Stick with OEM and replace every few years maybe 50-60,000 miles at most.
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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