Mercedes Power Unit issues: genuine alarm or temporary glitches?. Recent reliability issues have put Mercedes' Power Units under scrutiny, with multiple retirements raising questions about the team's engine performance.

Mercedes, is the reliability alarm real?

Talk about Power Unit reliability in Formula 1 has resurfaced like it hadn’t in a long time. The focus is on Mercedes, which is surprising since this is the team that has best understood how the hybrid engines introduced back in 2014 work.

However, recent problems have raised some eyebrows among the engineers at Brixworth; there have been three retirements between Imola, Monaco, and Barcelona involving Mercedes-powered cars: Kimi Antonelli has suffered the most, with an electrical problem in Emilia-Romagna and an oil leak in Spain, while in Monaco it was George Russell who lost power in qualifying after hitting a bump hard, and Fernando Alonso’s Aston Martin experienced a hybrid system failure during the race.

Something smells burnt

Whether this is a real alarm is still too early to say, but all these reliability issues are certainly unusual, considering these Power Units are at the end of their technical cycle and should therefore be quite reliable.

One issue that—for now—has not affected another Mercedes-powered team, McLaren. Could this be the only factor shaking Andrea Stella’s team’s confidence on the way to the title? Not impossible but highly unlikely, since each team manages cooling modes and mappings independently. Therefore, this risk may remain a concern limited not to the customer teams but only to the three-pointed star team.