Third-generation Chevy Spark (2011 and 2013-2014 model years) While the third generation of Chevy Spark got the much-needed exterior improvement, it turned out to be the least reliable generation. The 2011 model had a few issues including excessive oil consumption and the A/C problem, but 2013 and 2014 were the worst production years for the
First-generation Z4 (2003, 2005-2008 model years) The 2003 model is riddled with problems but less severe than the 2007. It had many reported coolant and oil leaks, engine overheating, failed front control arm bracket bushings, and other engine problems that keep the check engine warning light on. The 2005 Z4 inherited most of the problems of ORVwsA.