Hey there, welcome to The Oldsmobile Connection!
Also owning a 1987 Delta 88 Royale (not brougham), I can say that it is quite a reliable car. Had to replace gas tank, struts, brake lines, fuel lines, wheel bearing, uh...some other stuff too. But it all was pretty easy to do (I didn't install gas tank), and all of it was original parts! 1987 being 17 years ago...I'd say that's pretty damn reliable as nothing had ever gone wrong with it before. As an AC/DC song goes...."Hard As A Rock".
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Brando