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
Indianapolis 500 and engines were European, with the only American-based chassis to win during the CART era being the Wildcat and Galmer (which was actually built in Bicester, England) in 1982 and 1992, respectively. Ford and Chevrolet engines were built in the UK by Cosworth and Ilmor, respectively. Fernando Alonso was the most recent active Formula One driver to race at the Indy 500-mile race, in 2017. Prior to that, no active F1 driver had competed in the Indy 500 since 1984. After foreign cars became the norm, foreign drivers began competing in the Indianapolis 500 on a regular basis, choosing the