There is a story that floats around about the difference in quaility control between made-in-the-USSR and those copies made in Poland/Czech Republic.
When the first T-54s were sold to the Warsaw Pact, the engines were blowing at fairly short intervals.
The story goes that a Polish engineer, ordered to fix the problem, took apart several of the Soviet-made engines, and discovered, about 15kgs or so of metal grit, burrs, and other debris in the engines. It was reported in some engines, that it looked like the Soviet factory workers drilled holes into the metal, and instead of sweeping the debris away, simply pushed it into the interior of the engine, some of the oil lines were so blocked with debris, that oil could not flow.
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