Best of the type for chassis was the SAAB 9000, up to 1991. Fiat Chroma did not last long, Lancia Thema was ok enough with the swan song being the V8 "Ferrari" variant, Alfa 164 had several versions sold in the US Considered one but ended up with the SAAB 9000 for a long list of reasons.. Busso V6 has a glorious song, but finicky to care for and the transaxles are a known problem area as are the timing system in the Busso V6. Of all those Busso powered Alfa Romeo's IMO, the Milano Verde was the best.. Only real problem issues are the Bosch electricals.. That power train in the Milano has proven to be 24 Hours of LeMons tested tough and durable.
As for the SAAB 9000 variant of the type 4, the 1991 is current mileage record holder at 440,000 miles.
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The original transaxle died at about 180K. 5th gear dissolved under acceleration. Saab being Saab after discovering this problem, re-designed that part of the transaxle, then made update kits available to all service facilities at reasonable cost. Updated/rebuilt transaxle installed at about 180K, that transaxle remains in the 9000 to this day.. Bottom end on that Saab B234 has never been apart. One valve job, timing chain and such rebuilt at about nee 300K.. No wonder why there is an strong aftermarket for Saab B204/B234 turbo motors being installed into everything from Boats to kit cars to BMW, Miata, and much more..
Fond of the Busso V6 in many ways and there was a time when Coswoth in the UK wanted to purchase the design, production rights and all related from Fiat to be used as a production race motor offering.. Fiat refused..
Bernice