I never had any major issues with my m54 in my 330i with 175k and it's still going. Never had issues with the n54 in the 135i with over 120k when I sold it. Now it's too early to tell with my s55 now but it's been trouble free. All three vehicles have and had mild tunes. Maintenance is key and just don't beat the hell out of them. Plain and simple. BMW has been awesome to me.
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mr.paulo.dias
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