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I just turned 100k in my 50i. I just did plugs and coils (~$200) and I had to replace the PCV tubes. I replaced one with an eBay knock off ($50) and used heater hose and clamps to replace the larger PCV tube (BMW replacement is ~$350, no knock off available). I change my oil around every 5-6k miles (bc it makes me feel good) and I always use an OEM filter and Rotella T6 oil (I use less than a quart of oil between changes). Other than that, I've had no issues. Vehicle is tuned a BM3 Stage 1 flash stacked with JB4 @ 21.5lbs. Runs 11.7 in the 1/4.
Engine aside, I'm also gearing up for the following: transmission mount (have a low RPM vibration that I believe is being caused by this), front and rear diff fluids, tcase fluid, transmission fluid and filter, front control arms. Just need to find the time to do it all.
That's been my experience at least...
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2014 X5 50i, M-Sport, Bootmod3 Stage 1, JB4
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