Isuzu RZ4E enginesThe Isuzu RZ4E engine is a 1. 9liter turbodiesel engine that Isuzu uses in several of its modern vehicle lineups. In South Africa, the RZ4E engine is primarily fitted to the following vehicles: Isuzu DMAX (1. 9 Ddi models) Introduced in South Africa around 2022 as a replacement for some of the older 2. 5liter DTEQ engines. Found in lower to midspec variants of the DMAX bakkie range. Isuzu MUX (1. 9 Ddi models) The sevenseater SUV version of the DMAX