MEXICO CITY—Mexican used-car platform Kavak said it has more than doubled its valuation to $8.7 billion based on its latest funding round, making it the second-most valuable startup in Latin America as it eyes further expansion beyond its home market. Kavak’s chief executive, Carlos Garcia, told Reuters the Mexico City-based firm netted $700 million in its Series E round, making the platform second only to Brazilian fintech Nubank among the highest-valued startups in the region. The injection of capital has delivered a boost to Kavak’s plans to expand outside the region as a one-stop shop for browsing, purchasing, and financing pre-owned cars via an app. Kavak said funding was led by U.S. venture capital firm General Catalyst, while SoftBank Group Corp, billionaire Peter Thiel’s Founders Fund, Singapore-based gaming and e-commerce company Sea Ltd, Tiger Global, Spruce House, hedge fund D1, and Ribbit Capital also participated. The new funding round is …