The 5 Series. The BMW 5 Series is a mid-size luxury sedan that has been around since the early 1970s. This model has been praised for its handling and performance, but it has also had some serious reliability issues over the years.
Word on the street: is that BMW actually stands for "Break My Wallet." For every good-luck Johnny with a banging 528e, there are six more sad-faced Bimmer owners with maxed-out credit cards. Both 3 and 5 Series cars with six-cylinder engines are famous for cooling systems that leak and burst open. For example, try to avoid BMW 3 Series models from 2006, 2007, or 2013. When looking for the best BMW 3 Series years to buy, look for a model from the year 2016 onward, from the F30 or G20 generations. These BMW 3 Series model years have surprisingly few issues and seem to do well on reliability overall.E90 (2006-2011 3 series) is the most solid BMW out there now you can get under 10 years old. Specifically the face lifted model (2009-2011), and the 328i version with the 3.0 NA 6 cylinder. Yes, avoid the turbo charged 6 cylinders because of issues with the high pressure fuel pump (HPFP), VANOS, and other electrical gremlins.
6. 2006-2010 BMW M5 (E60) On paper, the “E60” BMW M5 should be the very best one — an impressive V10 power plant, an available manual transmission to run through the gears and (in Europe) a “Touring” station wagon version. Unfortunately, the E60 M5 was very different in practice. Reliability was off-the-charts terrible — and even IKAZ.