2 stroke diesels used in Tanks and APC's has a separate oil sump just like on a 4 stroke, it is not a moped engine. 2 strokes smoke more because of larger injectors and they always have pressure charged intake air by a compressor / Roots Blower. They usually have more torque at low RPM compared to a 4 stroke.
I was a Tank Mechanic in the Danish army, been working on Centurions, Leo 2, M113 and the M578 + Centurion recovery vehicle..