I went to the dealership today to check on trans fluid. The parts guys said that mercon V is not a synthetic, it is a different kind of fluid. They looked up the synthetic fluid and it was $14.91 a quart plus tax. Mercon/Dextron III was $2.19, and Mercon V was $3.31, plus tax.
6869, In my mothers expedition's owners manual for the E40d it says that you never have to change the fluid.
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