Afternoon,
I looked many time in Vida and no info about the haldex maintenance. No info at all about it.
I like to think oil need to be changed to have a longer components life.
I changed the oil on mine S80 AWD. I was surprise au clean the oil was (74K). I guess it was done before (maybe not as the AWD was not working). You need to remove the propshaft bearing carrier and then the disconnect it from the haldex unit flange. After you need to remove the flange (depend if you have enough space to remove the pump).After that you can access the pump. Changing the filter is really easy. However remove the pump was really hard. The pump was litteraly welded ! I changed the pump seals (cheap oring seal when you know the size with VIDA). Installation is not to bad. You need a tool to hold the flange when you torque the nut (150Nm).
You neeed some good tool and extension as the CV joint bolt on the top can be difficult to access and torque.
Hope this help.
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