Opel's financial transformation under PSA—and subsequently Stellantis—is one of the most dramatic turnarounds in European automotive history. The brand that General Motors reported as losing approximately €2.5 billion annually at the time of the PSA sale achieved its first positive adjusted operating income within two years, driven by cost reduction of a severity that shocked an industry accustomed to incremental improvement programmes. The financial details of Opel's stand-alone performance are not separately disclosed within Stellantis's consolidated reporting, which groups Opel with Vauxhall and the broader European brands. However, the transformation's magnitude is evident from the PSA era disclosures and from Stellantis's segment-level reporting. Stellantis's European brands collectively generated adjusted operating income margins approaching 5–6% by 2022–2023, a dramatic improvement from the losses that characterised the pre-PSA period and a margin profile that validates the cost restructuring logic. The key financial metrics that management monitors are cost per vehicle, revenue mix quality (the proportion of higher-specification vehicles and electric variants in total volume), and return on capital deployed in the brand. The platform sharing model means that Opel's capital expenditure requirement per vehicle is substantially lower than the industry average—Stellantis estimates that platform sharing reduces platform development costs by 40–50% compared to independent development—and this capital efficiency directly improves the return on investment for each model refresh or new model launch. Electric vehicle economics present a different financial profile. First-generation EVs—the Corsa-e, Mokka-e, and Astra Electric—are priced at a premium to their ICE equivalents reflecting higher battery costs, but their total gross profit contribution is currently below ICE equivalents due to the battery cost differential that has not yet been fully absorbed by scale. As Stellantis's battery cost reduction roadmap—targeting below €100 per kWh by mid-decade through manufacturing scale and chemistry evolution—delivers, the EV margin gap to ICE will narrow and eventually reverse, improving Opel's financial profile as the fleet mix shifts toward electric.