LOUISVILLE, Ky. (March 23, 2004) - Cummins Inc. (NYSE:CMI) today announced new extended oil drain intervals for ISX and ISM customers that use Valvoline Premium Blue® engine oil.

"We are committed to providing our customers with the most reliable and durable engines, along with the lowest total operating costs. The extension of the ISX and ISM engine oil drain intervals for those customers using Valvoline Premium Blue further solidifies Cummins as the leader in providing the lowest life cycle costs for our customers," said Cummins Executive Director - Marketing Tom Kieffer. "Through our partnership with Valvoline, Premium Blue has been extensively tested in our heavy-duty truck engines. Cummins and Valvoline Premium Blue customers can be confident that their engines will perform reliably with these longer oil drain intervals."

Premium Blue's unique Dispersive Polymer Technology (DPT), which provides advanced soot-fighting capabilities and cold start protection, has allowed oil drain intervals to increase from 15,000 to 20,000 miles (24,141 km to 32,187 km) for severe service, from 25,000 to 35,000 miles (40,234 km to 56,328 km) for normal service and from 35,000 to 45,000 miles (56,325 km to 72,421 km) for light-duty service.

Premium Blue, which is approved by Cummins Inc. for extended oil drain intervals, has been extensively tested on Cummins cooled Exhaust Gas Recirculation (EGR) engines in the lab and on the road. Premium Blue is formulated to protect modern environmentally friendly engines.

Premium Blue exceeds the requirements for the API CI-4 performance classification, as well as Cummins CES 20078 engine oil standards, intended to address strict new diesel emissions requirements.

"Our team worked extremely hard along with Cummins engineers to develop a high-quality engine oil that provides a better value to the customer in modern engines," said Dr. Fran Lockwood, sr. vice president, technology, at The Valvoline Company. "The extended drain capability in Premium Blue is a result of innovative chemistry proven by thousands of hours of engine testing and millions of miles of field testing."

The Valvoline Company, a division of Ashland Inc. (NYSE: ASH), has been serving American motorists longer than any other motor oil company and is a leading innovator and supplier of quality, high-performing automotive, diesel and industrial products in more than 140 countries. Valvoline Premium Blue and Premium Blue® Extreme carry an exclusive endorsement by Cummins Inc. For more information, visit the company's Web site at www.valvoline.com.

Cummins Inc., a global power leader, is a corporation of complementary business units that design, manufacture, distribute and service engines and related technologies, including fuel systems, controls, air handling, filtration, emission solutions and electrical power generation systems. Headquartered in Columbus, Indiana (USA), Cummins serves its customers through more than 680 company-owned and independent distributor locations in 137 countries and territories. Cummins also provides service through a vast dealer network of more than 5,000 facilities in 197 countries. With more than 24,000 employees worldwide, Cummins reported sales of $6.3 billion in 2003. Press releases can be found by accessing the Cummins home page at www.cummins.com.