 The V designation is also used for an unrelated diesel V6 engine jointly developed by Renault and Nissan, used in the Renault Laguna coupé, Latitude and designated V9X.The X engine (referred to as XZ and XY by PSA) was an all-aluminum overhead camshaft inline-4 jointly developed with PSA.Introduced in 1974, it powered the ill-fated Renault 14 midsize car and was phased out in 1982 by evolutions of the C series