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...