Donald Keith (D. K.) Ulrich (born April 10, 1944) is a former driver/owner in the NASCAR Winston Cup Series. As a driver, he had sixteen top ten finishes in 273 starts. His last race came in 1992. As car owner, he fielded cars for many years for young drivers such as Mark Martin, Sterling Marlin, Rick Mast, Greg Sacks, Davy Jones, , Morgan Shepherd, Tim Richmond, Ernie Irvan, and Richard Petty after his number 43 crashed in practice and the team's backup car was not allowed by NASCAR, the Petty team bought Ulrich's No. 6 Chevy and placed STP decals on the previously unsponsored car. Petty would finish 38th after an engine failure. He sold the team to Jasper Motorsports in 1994.