Mercedes Reliability
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McLaren's fuel issue limits running on day four of Barcelona F1 shakedown
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McLaren's testing day was curtailed by a fuel system problem on the fourth day of Formula 1's 2026 Barcelona shakedown, with Oscar Piastri completing just 48 laps. Mercedes continued its strong form, amassing 168 laps and setting the fastest time, while Aston Martin made its long-awaited debut with Lance Stroll before a stoppage caused a red flag. Ferrari also enjoyed productive dry running after earlier wet conditions.