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4.0l V6

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The 4.0L OHV engine was standard in first-gen Explorers and was the base model option in second-gen Explorers until ’01 models. They had cooling issues, so check for overheating and blown head gaskets before buying. The more powerful 4.0L SOHC engine had timing chain issues. Ask for documentation that the timing chain has been replaced if you’re buying a high-mileage Explorer with the SOHC V-6.