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The X16SZ is a 1.6L SOHC (Single Overhead Cam) engine produced by Opel (a subsidiary of General Motors) as part of the Family 1 engine series. It was used in a variety of vehicles, particularly within the Vauxhall and Opel range, which were sold across Europe. The X16SZ engine was part of the GM Family 1 engine family, which was used extensively in the 1980s and 1990s. The Family 1 engines were designed to be affordable, efficient, and easy to maintain, making them ideal for entry-level and mid-range vehicles.