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I can't argue about the lightly loaded 3800 lb with 6 cylinder powerplant part. I think ther eis a little more to the X5 story. Along with it being 5000 lbs there are two other factors. Since it is a SUV, it has a numerically higher differential ratio so it runs higher RPM for the same given highway speed. Other point is that since X5 has low and high pressure EGR, less soot is entering into the intake. The $5000 price seems high unless the head is removed and chemically cleaned. Seems to me that cleaning should be worked out along the same lines as the gasoline N54. The N54 is normally dealt with w/o head removal.
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