Well, I obviously haven't watched Copa Libertadores in the 80's and 90's (what I can remember), I'm not that old, but I doubt you remember the 80's either.

But as far as I can see they have 6 titles there since 1960. That's impressive, but not mindblowing. They don't even have most titles in the Argentine league either.
I couldn't find any H2H statistics with the big European clubs. Maybe you have a link?