[Prov1322]

Owned multiple early 60’s 122 wagons and 544 sedans when we lived in New England in the 70’s. every time we sold them for more than we paid for them. All had over 250K miles.

Even though the twin SU carbs were a nightmare to keep properly tuned in the middle of winter (which I never could figure out as they were SWEDISH cars) those things would run forever.

[Eric in the Ozarks]

In additional to the Volvo, I owned four Jaguars, all with SU carbs.
The secret of SUs was (and is) they need an overhaul kit every 30-40,000 miles. And I always used automatic transmission fluid in the dash pots (the little lube supply on the tops of the cars.) Heavier oil would just gum them up.