The Volvo Modular engine is a family of straight-four, straight-five, and straight-six automobile piston engines produced by Volvo in Skövde, Sweden since 1990. It was first available in August 1990 in the Volvo 960 in form of the B6304F engine. A year later, with the introduction of the Volvo 850 in June 1991, the first five-cylinder variant in form of the B5254F hit the market. In 1995 with the launch of the Volvo S40 the four-cylinder B4184S and B4204S engines were released.