The team's fortunes turned at the Italian Grand Prix. Although Merzario and Laffite started in the midfield, 15th and 17th respectively, and Laffite retired with an engine failure, Merzario finished fourth, scoring three World Championship points. This ultimately marked the car's best result under any of its three designations. In Canada their form dipped again with both cars qualifying in the lower midfield, and a double retirement. Merzario retired at half-distance with handling problems and the Frenchman was classified 15th after dropping out with a puncture. At the season-ending United States Grand Prix, Laffite outqualified Merzario for the first time (11th and 15th), but Laffite retired and Merzario followed him when his onboard fire extinguisher deployed and the engine cut out. This was the last race for the car as an Iso–Marlboro.