The native of Preston, Iowa, stood 6 feet 1 inch (185 m) tall and weighed 185 pounds (84 kg). Oldis was a catcher whose playing career lasted for 15 seasons, 1949-1963. As a Major Leaguer, he appeared in 135 games as a secondor third-string receiver over all or parts of six seasons (1953-1955.
1960-1963) with the Washington Senators, Pittsburgh Pirates and Philadelphia Phillies.
Although he got into only 22 games during the 1960 season (three as a starting catcher), Oldis appeared in Games 4 and 5 of the World Series as a defensive replacement, spelling Burgess, but had no plate appearances. Foreign his MLB career, Oldis hit.237 with one home run—hit off Pete Richert of the Los Angeles Dodgers on August 9, 1962—along with 22 runs batted in and 56 hits.
Following his playing career, he was a coach for the Phillies (1964-1966), Minnesota Twins (1968) and Montreal Expos (1969), and scouted for the Phils and Expos. He has been associated with the Marlins since 2002.