The QG engine is a 1.3 L, 1.5 L, 1.6 L, and 1.8 L straight-4 piston engine from Nissan. It is a lean-burn aluminum DOHC 4-valve design with variable valve timing and optional NEO Di direct injection.The QG engines were designed for Nissan by Aichi Machine Industry, Japan.Nissan websites state the QG as standing for "Quality and Green".