One of the most successful international business partnerships is undergoing review, say sources close to Ford Motor Co. and Mazda Motor Corp. In the wake of Mazda's financial problems and with plans for a joint-venture car in Europe near collapse, Ford is weighing its 25% stake in the Japanese carmaker. One source close to the deliberations says Ford may seek majority ownership to take fuller advantage of its manufacturing and marketing strengths and Mazda's engineering and product strengths. That would also ensure a stronger push behind Ford products in the Far East. Mazda executives have so far resisted ceding further ownership, but Ford may be calculating that Mazda is now vulnerable.

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