 Complete the following phrase:  Berger left the team for Ferrari at the end of 1986 and was replaced at Benetton by his former Arrows teammate Thierry Boutsen. BMW, which had supplied three teams in 1986, scaled back its operation to supply only Brabham in . With the Haas Lola team folding at the end of 1986, Benetton was able to take over its factory supply of turbocharged Ford engines. The B187 suffered with engine trouble at the start of the season, but became more consistent mid-season after reducing the effect of the turbocharger, taking numerous 4th and 5th place finishes as well as two 3rd places in Austria and 