I'll tell you,
with 250,000 kms on it, in Toronto Canada (quite the temperature extremes and humidity), and really, even though it didn't have regularly scheduled oil changes, it runs super quiet, makes great power, doesn't smoke, etc.. In that time, the only under hood work that was required was motor mounts (recent) and a fuel pressure regulator. That's IT!! ;) (Its been in our family since 1993)
I've owned several Alfa Romeo V6s, and yeah, I loved that V6. It also was all aluminum,
2.5 litre and 3.0 litre (but made much more hp/litre than the B280F, the 3.0 litre puts out 190hp) And the Alfa sounded amazing. I'd say its one of my favorite V6s around, next to the Dino (found in the Fiat Dino or 206/246 Dino, oh and Lancia Stratos). The Alfa engine uses a timing belt. The Alfa engine was also quite reliable, but noisy cams (constantly referred to as overheard-cams)
But, for a PRV engine, it certainly lives up to what I would consider reliable.