Bentley, Porsche cars least reliable: UK survey By: CNBC.com News April 16, 2015 at 12:35 PM EDT Bentley Motors has been named the least reliable used car manufacturer of 2015 in the U.K., followed by Porsche, according to a new survey. Read More >> Related Stocks: Atyr Pharma Inc Honda Motor Company ADR Porsche Auto ADR Suzuki Motor Corp ADR Toyota Motor Corp Ltd Ord ADR