Hey Vince,
Tis a shame you need to get rid of your VSX, especially now you have it all fixed and shiny.
I'm in the lucky position to have both an AL4 and a 4HP20 to hand. It’s hard to compare them as the engines their attached to are so different, which I think has a big influence on what their like to drive. Something’s I think are comparable, so here goes.
So quick compare.
The 4HP20 changes gear are smoother. Not to say the AL4 is rough, far from it, but you can notice the AL4 changes where as you rarely notice the 4HP20.
The AL4 is better for crawling in traffic, dose not have the 'confused' issue the 4HP20's seem to suffer from.
The AL4 never releases the engine whilst moving in D, so it seems like a manual gearbox, at first I thought mine was stuck in ‘down hill’ mode, but I’ve seen a few people mention this behaviour on an AL4.
I've previously driven a couple of non electronic autos, i.e. the old skool fully hydraulic, and I hated them, really hated them I think it was the arbitrary gear change points which bugged me, but I really like these 'modern' electronic ones, which can vary their change points. It might not be such an issue for you, The early Xantia’s and XM’s had the old style box’s, in the xantia you can tell straight away, as the gear selector mechanism is totally different, AFAIK the XM one looks the same.
Overall either the AL4 or 4HP20 are good boxes, I've no complaints, I would say though when looking at a cit with an auto box, either get one with low mileage or one with a history of oil changes in the box. My AL4 has done 90k miles on the original oil, I recently did 3 oil changes in 2 months on the AL4, even after the 3rd change the oil was still coming out gray, box still drive great though, but its worrisome to see such dirty oil. In contrast the 4HP20 had a known oil change at 80k miles, and possibly before (service history lost before 80k) as when I changed its oil it was quite golden.
Sealed for life… yer, if life is 100,000 miles.
That’s my experience with Autos, I’ve driven a few Jap auto’s to, the electronic ones are all fairly similar.
As for mpg, I get 27mpg from the V6, thats cross town daily commute, not done any motorways yet, and about 25mpg from the 1.8 on LPG, I would imagine petrol would be 2~3mpg higher, but I must point out the 1.8 has an intermittent fault on the MAP sensor which have not yet fixed so that’s probably screwing up the mpg figs.
Get a V6 Vince, you know you want to. One just sold on ebay for £499
http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... 0355165817
Although in saying that, here’s a nice AL4 example
http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... 0408156716
Gone to the dark side.
Past Citroens
'99 Xantia HDi Exclusive
'99 Xantia 3.0 V6 Exclusive (Green Goblin)
'02 C5 Hdi 110 LX Estate
'98 Xantia 1.8 sx auto with LPG
'00 Xantia Hdi (110) forte
'97 Xantia 1.9D sx
'93 Xantia 1.9D lx (my first) R.I.P