The Mercedes D.VI was an eighteen-cylinder, liquid-cooled W-18 type aircraft engine built by Daimler Motoren Gesellschaft (DMG) and used on a small number of German aircraft during World War I.

It was 44,3 liter W 18 cylinder aeroengine with 517 hp/380 kW power at 1400 rpm.

The engine weighed 1,636 lb (742 kg).

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