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The N20 was a staple global engine for BMW. It's used in many BMW models during it's lifecycle. I've researched this issue when years ago when I got my X1. Timing chain guide destruction is statistically very small. Speaking to my local BMW dealership tech lead, he said they have not seen any and advised regular oil changes + don't use ASS. In the end I decided to not lose sleep over it.
Coming from a line of Inline-6 BMW engines, I still can't fall in love with this turbo-4. Sounds horrible during cold start-up. Otherwise the e84 platform is great to shoot around town. Handles admirably for a CUV.
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