The VX had the old 3.8-litre V6; the VZ had the later Alloytec engine. I expect it would physically fit, but I would also expect the radiator and thermostat to be different. I wouldn’t recommend it.

My 2005 SV6 VZ Commodore has been overheating recently and the second time it had happened the power-train warning light came. I recently bought the car from a car-dealer second-hand and it was ...