Mercedes lead Barcelona F1 pre-season Day 4 as Aston Martin sits out

TL;DR Summary
Day 4 of the Barcelona pre-season test saw Mercedes top the unofficial times with a 1m16.4s lap (George Russell), while Aston Martin’s AMR26 did not appear on track. Ferrari and Mercedes logged heavy mileage, Cadillac and Audi joined the field, and McLaren’s Piastri cited a fuel-system issue that cut running short; with cold conditions, the times are not a reliable indicator of pace.
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- F1 teams are hiding early struggles with new cars. Should they let fans watch? The New York Times
- DEBRIEF: What happened on Day 3 of the Barcelona Shakedown? Formula 1
- F1 Testing: Oscar Piastri's running limited by McLaren technical issue as Aston Martin make first appearance in Barcelona Sky Sports
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