
More Power.
Both the 325i and the 330i get fresh engines for 2006: a new-generation 3.0-liter inline 6-cylinder. Designated N52, this smooth I6 has different output for the 325i and the 330i.
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The engine block is hewn from an innovative magnesium/aluminum composite, reducing weight by 22 lbs. In addition, the N52 features BMW's Valvetronic variable valve lift. Valvetronic has been featured in BMW V8s and V12s, but this is its first use in a BMW 6-cylinder engine. Valvetronic provides quicker engine response, better fuel economy, more power and a wider torque curve.

Fuel economy ratings have not been announced; however, while driving the 330i we observed an impressive average fuel economy in the mid-20s while driving quite aggressively. Projections for freeway economy could safely be in the 30 mpg range.
Both the 325i and 330i come with a standard 6-speed manual transmission; a 6-speed STEPTRONIC automatic transmission is optional. A 6-speed Sequential Manual Gearbox (SMG) will be available on the 330i later this year.
We didn't get a chance to try the automatic, but the 6-speed manual is very slick, with short shifts and smooth operation. BMW claims a 0-60 mph time of just 6.1 seconds, which may be conservative based on our driving experience. Surprisingly, cars equipped with the automatic transmission are only a few tenths slower.
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