This is the best summary I could come up with:

At the start of the year, we got the surprising news that Andretti Global was partnering with Cadillac to try to field a team in Formula 1.

That has been a contentious process, exposing a rift between the sport’s stakeholders, some of whom aren’t keen to add a new fish to the pond.

"With our deep engineering and racing expertise, we’re confident we’ll develop a successful power unit for the series and position Andretti Cadillac as a true works team.

Since the GM-designed and built engine won’t be ready until 2028, that still leaves the nascent F1 team looking for a powertrain it could use in the intervening years if it’s to join the sport sooner.

That’s currently a very short list: Mercedes, Ferrari, Renault, and Red Bull Powertrains (which took over Honda’s engine program last year).

Audi is entering as a powertrain constructor in 2026, and Honda is coming back that same year to power Aston Martin, with the Red Bull engine being rebadged as a Ford then, too.

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