When I did the first oil change in my gearbox, which is of the same basic type, as mine is a six-speed from 2012, the gear change quality improved quite drastically. Still, I didn't think it was bad before the change. I did the change just because I believe in maintenance, not only repair.
The oil change took place after about 120000 km. The old oil was dark red, not the bright red it's supposed to be.
It's soon time again, since the car has now done 230000 km. I'll come back around Christmas, when that has happened, to tell if the second change also makes a difference you can feel.
About 12 l of oil was used in the change/rinsing.
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