• Owners are saying that trucks that meet new regulations on diesel emissions are having more engine problems.
• For Class 8 trucks  those with gross weights above 33,000 pounds – Powers found that for year-old vehicles, owners are reporting 223 problems per 100 trucks this year after reporting 204 last year.
• Overall, satisfaction among all heavy-duty truck owners was at 737 points out of 1,000 this year, compared with 751 last year.

From the article:

Diesel engines that meet EPA regulations are once again taking a toll on heavy-duty truck quality and customer satisfaction, as customers are reporting more problems with their truck engines, according to the J.D. Power and Associates 2012 U.S. Heavy-Duty Truck Customer Satisfaction Study. ...