Brad Keselowski doesn't plan to unseat any of the Team Penske IndyCar drivers from their rides, but when the team offered the 2012 Sprint Cup champion a chance to take some laps in an IndyCar, he couldn't refuse.

Keselowski jumped in the car prepared by the team of series points leader Simon Pagenaud during a test on Wednesday afternoon at Road America in Elkhart Lake, Wisconsin.

There are no immediate plans for the NASCAR star to compete in an IndyCar event. The only IndyCar race that doesn't conflict with a NASCAR event this year is in August at Pocono Raceway, and Keselowski probably would need significant time in the car testing on a high-speed oval before even considering racing Pocono.

Brad Keselowski sits in an IndyCar prepared by the team of series points leader Simon Pagenaud before turning laps at Road America on Wednesday. Chris Owens

"First thing I told Simon is he has a very secure job, at least from me," Keselowski said in a news release. "I've got a lot of respect for him and his team, everyone at Team Penske.

"I learned a ton today and had a lot of fun. I've got to let it soak in here to think about all of it."

Keselowski described his experience later Wednesday on Twitter.

One of the best days of my life. Thank you everyone. https://t.co/9xiehaIGEv — Brad Keselowski (@keselowski) June 15, 2016

While the car was new for Keselowski, the 4.048-mile course wasn't. Keselowski finished fourth in the Xfinity Series race at Road America in 2010.

"The opportunity came up to dip my toes in the water and kind of expand my knowledge base and put it in the back of my mind -- for wherever it goes, I don't know," Keselowski said. "But it was a heck of an opportunity, and I'm glad to have a chance."

The braking was one of the biggest things Keselowski had to adjust to during his runs. Team Penske tweeted that he took 10 seconds off his initial lap time and had a top speed of 187 mph.

"You have to build confidence in it because the stock car does everything it can to wreck your confidence, and in the IndyCar, it's important to have confidence," Keselowski said. "So you have to kind of unlearn everything you learned in a stock car to be good in these cars. That's a heck of a process but a fun one.

"It's certainly a different feel, trying to get acclimated to a different seat, and you lean back more. I was kind of sitting in Simon's seat, and it doesn't always fit you perfect, so it wears you out pretty quick. But it's a good way to get worn out."

Keselowski gets back to his NASCAR job this weekend, competing in the Xfinity Series at Iowa Speedway during an off weekend for the Sprint Cup Series.