Question: what is the difference between the bmw z3 and z4?
Answer: The big gun engine in the Z3 is the 3.0-litre six-cylinder. The BMW Z3 and Z4 are genuine roadsters, not simply convertibles. ... Despite its different name, the BMW Z4 is really the second-generation Z3, it was given the new title to match the new naming system which sees the sporty variants getting even numbers.