People would often be surprised what engines they are running. Ford runs some of their own engines as well as Fiat and PSA engines (Peugeot/Citroen) PSA run mainly their own engines but also a few Fiat engines. PSA also builds a number of Fiat and Ford models as well as for the Mini. Fiat builds engines (some of them developed with General Motors) for a number of other manufacturers and builds some cars for other manufacturers (current Ford Ka). Engine sharing as well as platform sharing is very common in the industries. The days when manufacturers did their own things are long gone by.