Valvoline is giving NASCAR fans a great look into some of their favorite drivers in the latest installation of Valvoline’s interactive online challenge, “What’s Under the Hood.” This one is featuring Dale Earnhardt Jr. His auto questions in this week’s latest challenge kick it up a notch, testing under-hood knowledge from spark plugs to air-fuel ratio.

Earnhardt Jr. along with Hendrick Motorsports teammates Jeff Gordon, Jimmie Johnson, and Kasey Kahne each take a turn as host of the interactive quiz that tests the “Do-it-Yourself” car know-how of auto enthusiasts and NASCAR fans alike.

This week, fans are invited to take on round two of the challenge featuring racing legend Dale Earnhardt Jr. by visiting  Subsequent rounds featuring Kahne and Johnson will be released bi-weekly through early July, giving players plenty of opportunities to win prizes from limited edition gear to signed memorabilia and collectibles. Four lucky participants will be named finalists, and in the grand finale, the Hendrick drivers will go head-to-head in a race on behalf of all four finalists to determine the grand prize winner of a new car.

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