Transmission ATF replaced 3 liter of 6.7
 

The ATF change with removal of oil pan and filter only replaced 3
liters of 6.7L capacity. Given that the ATF change intervals are
168000 km for normal use, is it worth doing a drain and fill with 3L
more (I still have 2L leftover). I realize it is a diminishing return.
Just wondering if it is necessary.