Mark drove this specially painted car for the 1998 Brickyard 400 in Indianapolis. (SynPower was Valvoline's new line of synthetic fluids and fuel/oil additives.) This car was also raced at Talladega and Daytona in October. These pictures show the orange spoiler, front air dam, and roof number indicating Mark's eligibility in the Winston No Bull bonus.
In Indianapolis, Mark qualified 7th and finished 2nd behind Jeff Gordon.