MINNEAPOLIS--(BUSINESS WIRE)--Donaldson Company, Inc. (NYSE: DCI) today updated its guidance for fiscal 2015. “The second half of our fiscal year has been disappointing, driven by an unforeseen slowdown in our Engine Aftermarket distribution channels, further weakening in industrial conditions in China, continued softening in our Engine OEM Off-Road equipment end markets, and incremental pressure associated with the strong U.S. dollar, which we experienced throughout the third quarter,” said To