I don't agree with Joey at all. I've owned all the engines being discussed - JTS, Twinnie and Derv.
I've ran a JTS for about 6 months now and had none of the problems described. Could just be i'm lucky I suppose.
Just a few things to correct on
"MCSF is a question of not if but when on those" - This is a generic warning signal on the alfas (as we all know). The JTS engine is just as likely to have a problem as any other engine. The statement doesn't mean anything as MCSF could be anything!
"meant to be 165 BHP" - it was out of the factory, unlikely to find any high miler with the stated BHP. It also must be stated that the JTS is more powerful and more economical than a twinnie. That's a fact.
The oil issue. 1l/1000 miles isn't what ive been putting in mine. I've been watching the consumption very closely. It takes about 2/l per 6k so far. If you check other posts on this forum, you'll see usage seems to vary. Probably based an a variety of things, which i won't get into. The fact of the matter is the oil startvation issue is one that affects both twinnies and JTS engines, if you do lots of short journeys the variator gets starved of oil. This is not a JTS exclusive problem! That said, we've only just done the variator on my father in laws twinnie that we've had in the family from new at 140k, so hardly a time bomb. Oil startvation is a know issue and will depend on you type of driving. Buying a low mileage, newer, example will help as variator don't normally give up after 50K!
Regarding the sound, fair comment. I've had a twinnie and a busso and it is rubbish compared.
I've had a GT JTD and hated it. Not my thing. Sounded like, well, a derv! Cannot get on with that tractor sound, so for me even the JTS had a nicer tune to it. I think this is a matter of personal taste.
I think the choice of the OP will depend on the mileage. I would never buy a derv doing less than about 8k annually. The just get get clogged up.
I by no means love my JTS, its had its problems, but the point i'm making is that the extra power and mpg means its a better proposition than my old twinnie.
you have had one for 6 months,so enought time to get a feel for it. i also have had a twinnie (in a GTV) and currently run a derv.
I ran mine for about 6 months and did circa 14k in it, new variator and exhaust camshaft was required, it had 31k yes 31k on the clock when I purchased it and needed the exhaust cam replacing at 37k and the variator. one female owner and then an alfa mechanic, so well looked after and the history was full and honest.
That is unacceptable for any manufacturer or engine and it IS common on those.
MCSF is a generic warning but there are many more reasons why a JTS will trigger it...and those reasons tend to be bad news wallet wise.
They have ignition coil and injection issues FACT, most of them will go through ignition coils by around 60k, they are not cheap to replace as doing all four makes sense.
most will wear an exhaust camshaft, I have spoken to Jamie porter about this as he looked after mine when I had it. The answer was ''hardening issues' with the steel from which they are made, exclusive to JTS engines as they have a different profile on the exhaust camshaft to the TS, I believe the inlet cam is the same as a TS so Alfa used what was left over,hence most failures are exhaust cam.
the issues with the cams are exclusively an issue with the JTS as the direct injection contaminates oil causing it to thin fairly quickly in its life and lose some of its lubricating properties this with the above cam problems are a perfect storm.
and TBH the statement they were 165 BHP out of the factory, well with the utmost respect do a little research on this, many were nowhere near after dyno runs by JTS owners, and its common knowledge. yes age will affect it but mine had as stated 31k on the clock and was definitely not 165 BHP.
my derv was much more powerful even in stock form and I know the difference between BHP and torque. so I would say my JTS was pushing somewhere around 150 BHP, even after a new exhaust cam.
also I have just covered 27k in my 1.9 derv, not a single warning light ever for anything, the JTS had MCSF lights come up at least 3 times. once was coils, second time was injector, and third time was generic misfire, turned out to be camshaft.
it cost me nearly £1500 in 6 months of ownership...admittedly it needed a cambelt but no car on 31k should ever need a camshaft and variator.
Valinco I think you have been very lucky!
at least we agree on the sound, hate my derv at idle, think the twinnie sounds lovely and the JTS is not awful ,just a bit ''meh'' for an Alfa. but the power from a re-mapped derv is something else, it all depends on what you want.
tJTS are more grunty than the twinne though, although I think the TS is a more characterful engine and more reliable if well serviced, there are plenty of TS engines running 200k + miles I just don't think that a first generation JTS is capable of that.
the new ones developed in conjunction with GM and Holden are much better, but the ones in the GT, well its like buying the first batch of the new Iphone.
they have problems.
oh and they love a drink of oil AND petrol. all things considered the 3.2 wouldn't cost a lot less in fuel in real world terms.
we will agree to disagree as we are both taking as we find, two VERY different experiences of the JTS engine and both valid as you could have one or other depending on the luck of the draw.
I will say if your mileage is in excess of 10k a year look elsewhere.