1987 Indianapolis 500 Al Unser, Sr. held off Roberto Guerrero by 4.496 seconds, to win his record-tying fourth Indianapolis 500 victory. By leading the final 18 laps, Unser, Sr. tied the all-time record for most laps led in Indy 500 competition, and, at 47 years of age, also became the oldest winner of the 500. Mario Andretti's dominance of the month, and subsequent failure to achieve victory, was largely unprecedented in modern times. He led the practice speed chart on 11 of the 17 days (he participated in only 13 days), won the pole position, won the pit stop contest, had the fastest
2004 Indianapolis 500 damage. On race day, May 30, precipitation in Indianapolis totaled 3.80 inches; a record single-day amount for that date, and any date during the month since records had been kept. (W) = Former Indianapolis 500 winner; (R) = Indianapolis 500 rookie All cars in the 2004 Indianapolis 500 used Firestone tires. Notes: Race halted on lap 27 due to rain. The race was resumed and when rain pelted the Speedway again late in the race, officials waved the checkered flag 15 minutes after the traditional 6 PM closing time. It was only the second time in IMS history racing went