I know what it is.
Leopard 1 IV MBT with a 37 litre V10 engine, 105 mm Gun, weighing 42 Tonne. Built in Germany.
The smoothest vehicular ride I've ever had. Wonderful suspension.
I've even seen a bent con-rod and a cross section of a gun which seriously deformed when the shell jammed near the tip of the gun due to mud in the barrel.