It is not uncommon to hear of 300k mile bottom ends. There is of course the million mile E30 that Mobil 1 strapped to a dyno and ran non-stop, but that isn't quite real-life conditions. Someone had mentioned that they spoke with one of the engineers that helped design the M20 and it was designed for 500,000 km or 3xx,xxx miles, I am too lazy to do the conversion. If that is true, then that is pretty cool.
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