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I've never had the opportunity to drive an X5 xDrive30i (that's German marketing-speak for the gasoline six-cylinder version), but I'd say upgrading to this diesel is a no-brainer. For about $4000 more -- a surcharge you'll likely get back in tax rebates and fuel savings -- you have a markedly more powerful, more efficient vehicle. Like all the modern diesels we've sampled from German automakers of late, this 3.0-liter has no obvious drawbacks compared with a typical gasoline engine. There's no hesitation, no smell, no cement-truck noises. All you notice is a slightly different mechanical sound.inline_mediumwraptextright24585421/green/reviews/0908_2009_bmw_x5_xdrive35d0908_09_z+2009_bMW_x5_xDrive35d+side_view.jpgTrue