A rare collection of cars that competed in the Indianapolis 500 are up for bid this weekend by Mecum Auctions.

Mario Andretti, a four-time winner of the Grand Prix of Long Beach, will be one of two grand marshals for this year’s race.

The collection spans the multiple generations ... 1989: Unser Jr. bumps Mario Andretti’s car, causing the latter to crash — and paving the way for his second Long Beach win.

Mario Andretti was born to be a race car driver. The celebrated motorsports superstar won’t even entertain a question about what other position on a racing team he’d have liked to try out if ...