E85 · Z4 M Roadster

What the E85 Chassis Is

The BMW E85 designates the first-generation Z4 roadster body style, a two-seat, rear-drive convertible that replaced the earlier Z3. Penned under Chris Bangle's design leadership, the E85 introduced the controversial-but-influential "flame surfacing" look, with long hood proportions, tight overhangs, and a driver-focused cabin. On DreamBMW we catalog the 2007-2008 U.S.-market cars that represent the final, most-refined years of this generation before the folding-hardtop E89 arrived. These late examples benefit from BMW's magnesium-block inline-sixes and the availability of the high-performance M variant.

Models & Body Styles in This Generation

The E85 is a pure roadster—a soft-top convertible with no coupe body in this code (the fixed-roof car wore the E86 designation). For the U.S. market in these years, three variants are cataloged:

• Z4 Roadster 3.0i — the accessible entry point with the naturally aspirated inline-six.
• Z4 Roadster 3.0si — the more powerful magnesium-block six, the sweet spot for many enthusiasts.
• Z4 M Roadster — the M Division flagship, sharing its high-revving engine with the E46 M3.

You can confirm the exact build and equipment of any specific car using our BMW VIN decoder.

Engines & Drivetrains Offered

The E85 stayed true to BMW's inline-six formula, sending power to the rear wheels through a slick manual or optional automatic. The 3.0i and 3.0si used the modern N52 magnesium-aluminum six, prized for its smooth power delivery and strong midrange. The Z4 M Roadster stepped up to the legendary S54—the same 3.2-liter high-revving six found in the E46 M3, delivering razor-sharp throttle response and an intoxicating soundtrack past 7,000 rpm. This is the engine that defines the driving character of the model and its shared BMW performance DNA.

Notable Strengths & Ownership Notes

The E85 rewards drivers with tidy steering, a rigid chassis, and genuine open-top character. The N52-powered cars are relatively easy to maintain, while the S54-equipped M Roadster demands stricter attention—regular oil service and awareness of the well-documented rod bearing and VANOS considerations shared with other S54 applications. As values for analog, hydraulically assisted M cars climb, the Z4 M Roadster is increasingly collectible.

Enthusiasts cross-shopping this era often compare it with the contemporary E60 5 Series and the grand-touring E63 6 Series, both of which share BMW's mid-2000s engineering language. For a compact, driver-first BMW experience, the E85 remains a compelling used-market pick.