Is Olive Oil good for cardiovascular health?

Yes — the evidence for this is strong. Olive oil is one of the most extensively studied single foods in longevity research, both through its central role in Mediterranean-diet trials and in large cohort studies of the oil itself. That's reflected in an evidence score of 88/100 for its role in cardiovascular health, drawn from 6 studies (1 RCT), with an estimated impact on longevity rated substantial (80/100).