STP will return to NASCAR in June when it sponsors the Nationwide Series race at Chicagoland Speedway, and the following Sunday’s Sprint Cup Series race, according to ESPN.com.  ?That weekend, STP will appear as primary sponsor on Richard Petty Motorsports’ No. 43, driven by AJ Allmendinger.

The company has also signed a track sponsorship agreement with International Speedway Corporation properties, including Chicagoland, Darlington, Daytona, Kansas, Michigan, Richmond, and Talladega. STP has also signed a multi-year deal with Infineon Raceway.