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Donaldson Awarded Freightliner
Masters of Quality Award

MINNEAPOLIS (Sept. 18, 2007) – Donaldson Company (NYSE:DCI), a leading, worldwide manufacturer of filtration systems and parts, was honored to receive the Masters of Quality Award from Freightliner LLC. The award recognizes three Donaldson manufacturing facilities for excellence in the areas of accounting, marketing, purchasing, engineering and quality control.

Freightliner, the leading heavy-duty truck manufacturer in North America, has presented this award to the top two percent of its 1800+ supply base for the past 20 years. The Masters of Quality Award is the highest recognition that Freightliner gives to its suppliers, representing the best of the best among suppliers providing parts and components to Freightliner businesses. Recipients of the award must demonstrate exceptional results in delivering quality parts and components and display an ongoing commitment to quality improvement.

"This award demonstrates our commitment to customer focus and quality service," said Dennis Jandik, vice president, Global OEM Sales at Donaldson. "Freightliner sets the bar high in all areas of quality along the supply chain process. The Donaldson team understands the importance of delivering to these standards and is pleased to be recognized by this valued customer."

Donaldson has been a Freightliner certified supplier for more than 40 years providing first fit air intake filtration systems and exhaust/emissions products.

Donaldson accepted the award honoring its Baldwin, Wisconsin; Dixon, Illinois, and Grinnell, Iowa facilities on Aug. 28, 2007.

About Donaldson Company
Donaldson is a leading worldwide provider of air and liquid filtration systems and replacement parts that improve people's lives, enhance our Customers' equipment performance and protect our environment. We are a technology-driven company committed to satisfying our Customers' needs for diesel engine equipment and industrial filtration solutions through innovative research and development, superior technology, and global presence. Our 12,000 employees contribute to the company's success by supporting our Customers at more than 100 sales, manufacturing, and distribution locations around the world.

Donaldson is a member of the S&P MidCap 400 and Russell 1000 indices, and our shares trade on the NYSE under the symbol DCI. Additional information is available at www.donaldson.com.