The BMW Z4 has faced some common issues, including problems with the electrical system, such as malfunctioning infotainment features and battery drain. Additionally, certain models have reported issues with the cooling system, leading to overheating. Some owners have also experienced premature wear on tires and brakes. Regular maintenance and timely inspections can help mitigate these concerns.
I'm affraid that carmax don't sell BMW Z4 Roadsters. They sell other kinds of BMW Z4 though, including convertible types. I think it will depend on if they can get any in second hand.
The 2004 BMW Z4 has 24 valves.
The 2012 BMW Z4 has 16 valves.
The 2013 BMW Z4 has 16 valves.
The 2011 BMW Z4 has 24 valves.
The 2010 BMW Z4 has 24 valves.
The 2014 BMW Z4 has 16 valves.
The 2007 BMW Z4 has 24 valves.
The 2006 BMW Z4 has 24 valves.
The 2009 BMW Z4 has 24 valves.
The 2008 BMW Z4 has 24 valves.
The 2005 BMW Z4 has 24 valves.