TSO Note: This weeks primary sponsor PennGrade Motor Oil tweeted out a picture of the livery for this week. What a way to start the week! Check out #PennGrade as primary sponsor on @GrahamRahal's @ToyotaGPLB car! #IndyCar pic.twitter.com/sbLRelFrZr — PennGrade (@penngrade) April 11, 2016 It’s a very stunning livery, and if you have very sharp eyes, […]

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