NASCAR to use unleaded fuel in Auto Club 500

Updated: February 23, 2007, 9:05 PM ET
By Terry Blount | ESPN.com

FONTANA, Calif. -- Sunday's Auto Club 500 marks the first time the Nextel Cup teams will use unleaded fuel.

Doug Yates, co-owner of Robert Yates Racing and one of the most respected engine builders in NASCAR, has concerns about making the switch in a 500-mile event.

"Unleaded fuel is a big change for these engines," Yates said. "Taking the lead out takes away some of the cushion, some of the lubricity of it. So we can have problems with the valves. We've been through a process of trying ...

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