Did Mitsubishi build the 3.2 liter Mercedes-Benz engine?

No, Mitsubishi did not build the 3.2-liter Mercedes-Benz engine. The 3.2-liter engines used in Mercedes-Benz vehicles, such as the M112 and M113 series, were developed and manufactured by Mercedes-Benz itself. Mitsubishi and Mercedes-Benz have collaborated in various capacities over the years, but engine production was typically handled by the respective companies for their own designs.