Hi there. If you do a forum search for '145 buying' or similar you should find loads of info.
The models are Boxers - referring to the engine style. I'm not sure I've heard any complaints about them, but they are possibly a little underpowered. Of course the best to get - if you can find one - is the 2 litre cloverleaf.
Most important thing to look out for is that the cambelt change has been done recently. If not, then plan on getting it done yourself. Also, if the engine sounds a bit rattly - like a diesel - on start-up, then add a variator to that cambelt change.
If you can get yourself a 2.0 Cloverleaf, you will have one of the most fun and charcterful Alfa Romeos of recent times.
You need to check that the cambelt, balance belt and tensioners are changed every 3 years or 36,000 miles. You may want to change the variator at the same time. All the spark plugs should be changed at 60,000 miles. Keep an eye on the oil level. Any clonks or knocking from the front will be the suspension bottom arms. The bushes are weak and often fail.
Other than that they are tough cars.
one of the things I heard about more than one time regarding boxers is that they are harder to maintain, in other words, they require much more skilled AR mechanic, which is rare or at least harder to find here (Cro).
They are more oil thirsty, only older models of 145s were shiped with boxer engine (correct me if I'm wrong) so that means they have much higher mileage on their meters(of course there can be exception to this, but who would buy famous AR boxer just to keep it in garage .
Sound of the boxer engine is great, there is no doubt about it, but you
need to rev it higher in order to reach that beautiful sound.
Any older engine will drink a little more oil than a newer one... It's not a big deal. Just make sure you watch the levels.
Maintenence in my opinion is easy on a boxer. They can be serviced in most cases in situ. I love boxer engines!
Here in Portugal we also got the 145 & 146 int he 1.4 Boxer engine with 90Hp... Drove one once and it went pretty well and at the time I was towing a Golk MKII 1.6D
I disagree that you have to rev boxers to hear their sound With Boxer engines you get and extra delight when you exchange gear at high revs Anybody that has driven them knows what I'm saying Especially in a 33 with a couple of twin carbs Ooooooooh fantasitic
All the Best
P.S If you get an TS check if it's idleling correctly.... otherwise you will probably need an Idle actuator...
Driving is a Passion... but doing it with an Alfa is a way of life...