Teams consist of one, two or four cars, with most one-car teams forming an alliance with a two-car team.
Meanwhile, Mario and Michael Andretti didn't do much to strengthen the argument in favor of two-car teams.
The two-car team was run by Joest Racing.
Mike Beam, brought in as crew chief on Nov. 30, 1989, left for Junior Johnson's two-car team this season.
It was originally planned to restrict entry to two-car teams, but this requirement was later relaxed.
With the exception of the Penske organization, the recent history of two-car teams on the Indy-car circuit has not been good.
Each summer's signature event was the "Riverside 500", a 500 lap "tag-team" race with 16 two-car teams.
Junior Johnson, the legendary car owner from the North Carolina hill country, has given up his three-year experiment with a two-car team.
Critics suggested that Johnson, whose two-car team won fewer races per year than when he only entered one, was spread too thin.
Scott Sharp, a national amateur champion, is his partner in a two-car team.