Tip - What Is a BMW 523i? | eHow

The BMW 523i is a model of car from German automaker BMW's 5 Series line of mid-size sedans. While the 5 Series has been available since 1972, the 523i model was first offered in 1996 as part of the 4th generation of the 5 Series. When it was being manufactured the 523i was among the lower-priced offerings within the 5 Series.