2010 Mini Cooper (R57) - Convertible - 1.6L 4 Cyl (16 Valve) From 06/2010 - 02/2012. 2010 Mini Cooper John Cooper Works (R57) - Convertible - 1.6L 4 Cyl (16 Valve) - Turbo From 06/2010 - 02/2012. 2011 Mini Cooper (R57) - Convertible - 1.6L 4 Cyl (16 Valve) From 06/2010 - 02/2012.