Table:
text: Winchester 400
History
History
Year_ Date_ Winner Make_3 Pole Make_5 Results_
1970 October 4 Dave Sorg Mercury Ron North Oldsmobile Report
1971 October 3 Denny Miles Chevrolet Les Snow Plymouth Report
1972 October 1 Dave Sorg Chevrolet Larry Moore Chevrolet Report
1973 September 30 Vern Schrock Pontiac Ed VanderLaan Chevrolet Report
1974 September 29 Bob Senneker Chevrolet Vern Schrock Chevrolet Report
1975 September 28 Bob Senneker Chevrolet Larry Moore Chevrolet Report
1976 October 4 Bob Senneker Chevrolet Bob Senneker Chevrolet Report
1977 October 2 Bob Senneker Chevrolet Bob Senneker Chevrolet Report
1978 October 1 Bob Senneker Chevrolet Bob Sensiba Chevrolet Report
1979 October 7 Don Gregory Oldsmobile Randy Sweet Chevrolet Report

text: Winchester 400
History
History
Year_ Date_ Winner Make_3 Pole Make_5 Results_
1991 October 6 Glenn Allen, Jr. Chevrolet Mike Eddy Pontiac Report
1992 October 4 Tim Steele Chevrolet Mike Garvey Ford Report
1993 October 3 Mike Cope Oldsmobile Hal Goodson Ford Report
1994 October 2 Mike Cope Oldsmobile Toby Porter Oldsmobile Report
1995 October 1 Mike Cope Chevrolet Ron Barfield, Jr. Ford Report
1996 September 29 Scot Walters Chevrolet Wayne Anderson Chevrolet Report
1997 September 28 Hank Parker, Jr. Chevrolet Nipper Alsup Chevrolet Report
1998 September 27 Derrick Gilchrist Chevrolet Jeff Fultz Chevrolet Report
1999 September 26 Brian Ross Chevrolet Matt Hagans Ford Report
2000 October 1 Gary St. Amant Chevrolet Larry Foyt Pontiac Report

Question: In the Winchester 400 list, how many winning Oldsmobile vehicles made the list?