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When the 3-series began to get too expensive in the late 1980s, BMW introduced the 318i as an entry-level model. In the engine bay of the 318i, a 1.8 liter four cylinder sat in place of the inline-6 on the 325i. The 318i offered the look and style at a significantly lower price. Four-cylinder BMW 318i parts tend to be more economical that the six-cylinder models.