Yes, that's right - another froggie car owner from down under. I should have joined years ago, as this site appears to be the English speaking world's centre for Xantia knowledge (among other things)
Brief introduction:
Had a couple of 504 sedans in the 80s (living in Canberra at the time), then came to England for a couple of years (90-92), where we owned a rusty 504 Familiale, which was none the less excellent for our needs - did trips up to Peak and Lake Districts, Cornwall, France (twice). On return to Oz, we moved to Armidale, and had nothing to do with French cars until 2006, when we bought a 307 Touring Wagon (only new car we've ever owned).
As it was my wife's car, I got jealous and bought a 9-year old S1 Xantia TCT. I had never even heard of a Xantia, but joined Aussie Frogs after buying the 307... After 3 years/75k km, we sold the 307 to fund a kitchen reno (that's a renovation, not a Renault), and I picked up a low km S2 605 (still had the Xantia). Only 48 605s were sold in Australia, & I was warned by the experts on Aussie Frogs that it would be the most unreliable car ever made, it would blow head gaskets etc etc., but it was more less local, and low mileage (c. 70k km).
Suffice it to say that the 605 has now clocked over 200,000 km and is still going strong, however too many things went wrong with the Xantia - it failed rego in about 2013, and has been parked. About then we acquired a 406 D9 SV, and an S2 Xantia wagon, which went to my son for 4 years but is back home now. Then in 2016 I flew to Adelaide, and drove home an Activa (S2, TCT). Unfortunately there were a few problems needing resolution, and once the South Australian registration ran out, I put it in a shed, but now in lockdown I've been reading CitroJim's How to's on subjects like repairing Activa rams, and am getting motivated to do something about it!
Thanks for reading - I know that when I get serious with this Xantia, I'll find lots of answers here.