Effortless Excitement. The six-cylinder petrol engines. The six-cylinder Z4 Roadster models deliver efficient and powerful performance. The 195 KW 3.0si accelerates from 0 to 100 km/h in a mere 5.7 seconds, with the 2.5-litre versions following hard on its heels. The 160 KW 2.5si reaches the 100 km/h mark in 6.5 seconds, while the 130 KW 2.5i needs just 0.8 of a second longer. Even more impressive is the effortless smoothness with which these aluminum/ magnesium engines
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