Tier 4 EPA regulations create unprecedented challenges for many OEMs, as they require extensive testing to ensure end products are compliant. Mastry Engine Center now offers design and performance analysis services for its OEM customers to help with this hurdle. The diesel engine specialist said it can also streamline business for those who use its engine brands for their own equipment, with its sub-assembly and private label options. Mastry draws from more than 50 years of industrial and marine diesel engine experience to help its customers succeed.