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its inside the transmission
Remove transmission oil pan for access
7quarts for transmission filter change.
transmission filters are generally located just inside the transmission oil pan, have to remove pan and drain fluid to change filter.
The Transmission filter is on the Inside of the trans. The only way you can change it is to take trans apart.
5 quarts
Remove transmission oil pan for access to filter and to drain fluid
960 S90 does not have a cabin air filter, Volvo started putting them in the 850 deries
To change the transmission oil you must take off the transmission pan. Make sure to change the filter while you have the pan off. It is inexpensive and will give your transmission a prolonged life.
Fluid fill after filter change is usually in the 4-6 quart range.
In the transmission pan
You can just change fluid, filter and gasket