" It seems that as these cars age . . . "
I think there's some truth in that, Mark, but nothing that can't be nailed by understanding how the complexities work, and pulling it all together. A good XM-era Citroen workshop will be able to do this, but finding one still with the expertise isn't easy. Mechanics and cars have moved on to newer models, and so the number of XMs and Xantias they see (let alone BX, CX) is a bit limited. One of my favourite southern-UK Citroen garages - SGG (prev. Shalford Green Garage) in Dunsfold, Surrey - now has just one mechanic (Tom) who knows 'the old stuff'.
That's where the Forums come in, and there's no shortage of XM know-how on these. Trouble is, geographical proximity isn't always kind, as you've found out. At least, though, if a Forum can help with the diagnosis, a half-decent workshop can be pointed in the right direction - or even reminded (tactfully) of how something ought to be done.
On the XM suspension, it only takes one misbahaving widget to turn a wonderful ride into a lumpy one, but if the fault can be identified, it's hugely rewarding, and tends to stay that way. Complicated it may be, but unreliable it isn't!
