LOUISVILLE, Ky. (March 23, 2004) - Cummins Inc. (NYSE:CMI) today introduced the ComfortGuard™ system, providing fleet owners and drivers with fuel savings and reduced emissions while heating or cooling the truck cab.

Cummins ComfortGuard is fully integrated with the vehicle's heating/ventilation/ air-conditioning (HVAC) system, so that the vehicle's main engine does not have to be running to provide heating and cooling for the cab. The ComfortGuard idle-reduction capability is provided by a two-cylinder diesel engine and an Onan® genset that's been a mainstay of the RV and Marine markets for years.

"ComfortGuard is part of Cummins commitment to customers to achieve the lowest operating costs while providing measurable environmental benefits," said Cummins Executive Director - Marketing Tom Kieffer. "In addition to reducing idle time, the Cummins ComfortGuard system will provide the end user with up to an eight and one-half percent fuel economy improvement, based on 2,000 hours of operation in a 12-month period. ComfortGuard is able to do this while providing outstanding cab heating or cooling because it is fully integrated with the vehicle manufacturer's HVAC system."

The ComfortGuard system also provides enhanced functionality from a power standpoint, so that end users will be able to operate computers, microwaves and other electronic devices with its 12-volt DC and 120-volt AC auxiliary power.

ComfortGuard will be available in early 2005. 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.