Product Overview This oil cooler is an OEM replacement part for the Isuzu 4JJ1 / 4JK1 3.0L diesel engine. It is widely used on the Isuzu D-MAX pickup, ELF truck, and Hitachi ZX110-3, ZX120-3, and ZX130-3 excavators. The unit adopts a multi-layer stainless steel plate stack structure, delivering high heat exchange efficiency along with corrosion resistance and pressure resistance. It effectively controls engine oil temperature, prevents high-temperature oil deterioration, and