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1992 Ford Aerostar 3.0 automatic. 112,000 miles on engine. Oil Use Interval: 21,000 miles (mainly highway – less than 1 year) Oil: Amsoil Series 2000 0W30 (SL) Make-up oil added: 3.5 qts. Blackstone's comments: We think 21,000 miles on an oil is too long for this engine to handle. Please note...