As I understand it, the motor oil that was approved for use in the Allison AT545 transmission was a NON-DETERGENT motor oil. This is critical, as a "real" motor oil would be far to slippery. After all, an automatic transmission functions by friction clutches. The reason for using the C4 non-detergent motor oil in the AT545 was to reduce slippage in the non-lockup torque converter.
Last I heard, this practice has gone out of fashion as there were problems with the C4 oil also.
With a DT466, you probably have an MT643 tranny, which has lockup.
Dexron or TranSynd, from all I have heard so far. Change often, including the filter, and don't let it get too hot.
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