You mean 4L as a partial change? The capacity is more like 9L. To get a full change you need to change what's in the torque converter, which on your model year (I think) can only be done by pumping out through the oil cooler inlet line (no more drain plug).

It's a good idea to change the electrical connector at the same time, since that is a known source of leaks, and the fluid wicks up to the control unit.

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Prost!