text: The QR family of inline-four piston engines by Nissan were introduced in 2000 and range from  in displacement. These motors are aluminum, dual overhead camshaft (DOHC), four-valve designs with variable valve timing and optional direct injection. The engine shares much of its architecture with the YD diesel engine.
  QR20DE
  The  QR20DE produces  at 6000 rpm and  at 4000 rpm. The bore and stroke is  and a compression ratio of 9.9:1. The QR20DE was replaced with the MR20DE engine in most applications in early 2005.
  Vehicle applications:
  2001-2007 Nissan X-Trail T30,
  2001-2007 Nissan Primera  P12
  2002–present Nissan Serena C24,
  2003-2008 Nissan Teana J31,
  2001-2005 Nissan Wingroad Y11
  2002-2005 Nissan Avenir W11
  2001-2004 Nissan Prairie M12
  2007-2020 Nissan Atlas F24
  2014-present Nissan Urvan E26
  QR20DD
  The QR20DD is similar to the QR20DE but features NEO direct injection to improve fuel economy and to reduce emissions. It produces  at 6000 rpm and  at 4400 rpm.
  Vehicle applications:
  2000-2004 Nissan Bluebird Sylphy
  QR25DE
  The QR25DE is a  variant built with cast steel connecting rods, a steel timing chain, counter-rotating balance shafts, and an aluminum intake manifold. The engine bore and stroke is  and a compression ratio ranging from 9.5:1 to 10.5:1 depending on the vehicle.