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The one you drive the least, no all kidding aside my wife has 60k on her 50i and although I have only owned it since 40k we have had no problems with it other then in needing a couple quarts of oil every 4-5k miles. The dealer justed changed the plugs and coils free of charge cause was have drivetrain malfunction. Even though the 50i has been good so far I would say the 35i would probably be more reliable, I had a x3 prievously with the n55 and never had any issues Engine wise, just change the oil.
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2022 x5 m50i - Dravit grey
2005 evo 8 (current) built 2.3 488/409 mustang dyno
Old stable mates - 87 325i, 88 m3, 90 m3, 97 m3 4dr,
04 325xi, 91 gmc Syclone, 08 335xi, and 13 x3 35i msp
2014 x5 50i msport
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