BMW 6 series 2020 3.0 diesel service and maintenance
340 HP, 700 Nm, Automatic gearbox, All wheel drive (AWD, 4x4)
Engine oil
Engine oil capacity: 6.5 litres (6.9 quarts)
Recommended oil type (Oil Viscosity Classification SAE) is 5W-30, 5W-40
Timing chain
Manufacturers recommended timing chain replacement interval for BMW 6 series 3.0 diesel is 200,000 km.
Based on real life experience, the BMW 640d 2020 timing chain change interval is approximately 120,000 km as at this mileage it may become overstretched and require replacement, so it is recommended to check the condition of the chain periodically after this mileage is reached and replace the timing chain if it becomes excessively stretched or if unusual engine noises occur.
Always consult your vehicle manufacturer's service manual for service intervals and specifications!