Some very high milers in these posts, makes my 135,000 look quite small!
I had a ZX Avantage estate, as a temporary "keep me mobile" car, and ended up keeping it for 5 years. Oil changes every 6000 using Millers XFE 10w-40 kept it clean and reliable.
The XUD9 was a good engine, not too quick off the mark, but very reliable, the cooling system mentioned by one or two was easily bled if you used a old plastic bottle. This had to have it's bottom cut off, then screw into the filler. Fill it with coolant to raise the header level higher than the heater and bleed with the various taps fitted.
The engine is still used at engine test labs for nozzle blocking tests, developing fuel additives etc. Spares are readily available, not that you need much apart from filters really.
Although a lot of the cars have expired, many engines continue as diesel conversions in things like Vitara's.
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You'd be hard-pushed to find a better engine for an everyday car, in my opinion. I'm on my third 405TD and it makes them a very good car to drive/own, for what they are and the cost to buy.
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Yes I had an XUD in a 405, my first diesel. I think its safe to say the XUD broke the diesel market open in the uk for passenger cars.
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The cooling system mentioned by one or two was easily bled ...
The PSA 1.6 diesel fitted to the 207 claims not to need coolant changes. When I queried whether this was advisable, I was told that if coolant was changed, only the pre-mixed Peugeot coolant would do (clearly to sell expensive stuff) but that uses deionised water. To me that seems a plausible explanation, and presumably one could mix one's own. I don't know how long it would stay deionised in a tired old XUD where corrosion is well under way - any suggestions?
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I know that PSA garages used to sell pre-mixed coolant, maybe they still do?
What I used was PSA recommended Procor 3000, which was neat and mix it 50/50 with DI water. It doesn't add much to the cost to use DI water, and keep internal corrosion at bay as long as possible. Some antifreeze loses it's anti corrosion properties after 2 years, some after 5 years. Unless you have a car from brand new, and know for sure what is in there, I would play safe and get the coolant changed, whatever the dealers say.
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Excellent engines.......I remember a Pug 305 we had on the taxis years back, most of the body was original but it was on it's second engine, the first having done 500,000 + miles and the second was close to 600,000. I'm pretty sure the various drivers didn't treat it that well either.
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Agree with all the above posters, I bought a 5-year old 405TD estate showing 350,490 miles (still got a photo of the odo somewhere) and ran it as a second car for a year before px'ing it. Seen several cabbed 405s with mileages north of 300k, whereas Xantias seemed to be let down (pun intended) by their suspension at around 200k, long before the engine was finished.
I knew a guy with a XUD-engined 205 who worked in motorway maintenance - his H reg car had an orange beacon on the roof, chevrons on the bootlid and 520,000 miles on the clock. They used it as a "runner" between sites and offices, sometimes doing 400 miles a night!
So yes, I think the conclusion here is that the XUD engine is reliable.
Dave TD
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Worth noting that the OP is asking about the NA XUD, not the XUD TD that most of us have used. The non-turbo version is far less willing, less torquey and not much more economical, and really no fun to drive, as you need to change gear a great deal due to the very narrow power band.
See if you can find a TD to try out, and you'll see what I mean.
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I had the non-turbo XUD in a couple of ZXs. No problems at all.
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