By Jeff Bennett 

KANSAS CITY, Kan.-- General Motors Co intends to invest $174 million in its Fairfax assembly plant here as it uses its strong balance sheet to increase productivity at its U.S. factories and bolster its vehicle portfolio.

Chief Executive Mary Barra--expected to speak here Monday to celebrate the company's milestone of producing 500 million vehicles globally--is plowing $5.4 billion into U.S. factories over the next three years as she looks to deliver on the company's goal to boost its North American operating margin to 10% from 8.8% of revenue.

One way to meet that goal is by creating more consumer buzz around the company's sedan lineup. In 2013, the company completely redesigned the Chevrolet Impala. Now the 2016 Chevrolet Malibu will have a sleeker look and shed 300 pounds compared with its predecessor. Designers stretched the back seat giving passengers an additional 1.3 more inches. It will also be tricked out with the latest technologies such as 4G Wi-Fi and a lane departure warning system. The 2016 arrives in showrooms in the fourth quarter. Full pricing has yet to be announced but the 2015 model starts at $22,500.

The auto maker is also planning to roll out a new sedan in the Cadillac brand known as the CT6 which GM claims to be the lightest compared with its rivals due to the high use of aluminum in its construction. The vehicle is set to challenge the likes of Daimler AG's Mercedes-Benz brand. The car is slated to go on sales in either later December or early January. Pricing hasn't yet been announced. An update to the Buick LaCrosse is also slated for the 2017 model year. The LaCrosse is built alongside the Malibu at the Fairfax plant.

Some of the $174 million investment will be used to install a "Shake and Rattle" booth which simulates any road condition customers might experience. It also identifies any sources of noise in the interior so it can be fixed. The booth could be one technology GM rolls out to more assembly plants.

The Fairfax plant employs 3,230 hourly workers and 270 salaried and has produced more than 12 million vehicles since production first began in 1945. The plant operates on three shifts and produces one vehicle every 58 seconds.

Separately, as part of the 500th million vehicle milestone celebration, Ms. Barra is expected to announce all U.S. salaried and represented employees and retirees can share a one-time customer appreciation discount in the third week of May. The discount can be combined with other incentives. The amount of the discount wasn't immediately disclosed.

"During 2015, we expect to sell more than 1,000 new vehicles per hour, 24 hours per day," Ms. Barra said in statement. "This adds up to nearly 10 million vehicles, the most in our history. I look at this extraordinary volume as 10 million opportunities to prove what kind of company we are and to say thank you."

Write to Jeff Bennett at jeff.bennett@wsj.com

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