A six-year sales run starts to sputter.

Workers are threatening to strike.

After a strong January for the auto industry, forecasts call for rising car sales in 2015—followed by more increases in the years ahead. So what's this business about already hitting "Peak Car"?

GM's strong May sales show consumers are looking beyond the automaker's recent quality issues. Unfortunately, the company faces other challenges.

Ford has done well to improve its sales, but can it get into luxury market and broaden its reach overseas.