The parent of the VK56DE engine was the VK45DE. Unlike its older relative, this engine acquired a larger cylinder block with a height of 232 mm, due to which the connecting rods were extended to 154.5 mm. The cylinders themselves began to be produced wider by 5 mm, they became 98 mm wide, and a new crankshaft was also installed, which made it possible to increase the piston stroke to 92.8 mm. All the changes led to the fact that the engine began to have a lower Compression ratio and a larger displacement, which was 5.6 liters. The cylinder head is aluminum, the valve timing system on the CVTCS outlet camshafts has become stepless. A chain is used to drive the timing. The result is a motor perfect for pickups and SUVs, taking traction from low revs.
Specifications
| Manufacturer | Decherd Plant |
| Also called | VK56 |
| Production years | 2003 |
| Cylinder block alloy | aluminum |
| Fuel system | injector |
| Configuration | V |
| Number of cylinders | 8 |
| Valves per cylinder | 4 |
| Piston stroke, mm | 92 |
| Cylinder bore, mm | 98 |
| Compression ratio | 9.8 (VK56DE) 10.8 (VK56VD) |
| Displacement, cc | 5552 |
| Power output, hp | 305/4900 325/5200 405/5800 408/6000 |
| Torque output, Nm / rpm | 522/3500 533/3400 560/4000 550/4400 |
| Fuel type | 95 |
| Euro standards | — |
| Weight, kg | ~227 |
| Fuel consumption, L/100 km (for Infiniti QX80) — city — highway — combined |
20.6 11.0 14.5 |
| Oil consumption, gr/1000 km | up to 1000 |
| Recommended engine oil | 5W-30 / 5W-40 / 10W-30 / 10W-40 |
| Engine oil capacity, liter | 6.5 |
| Oil change interval, km | 10000 (better 5000) |
| Normal engine operating temperature, °C | — |
| Engine lifespan, km — official information — real |
— 400+ |
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