Opinions about longevity of oil-filled caps

[Ralph S]

I'm working on a piece of late 1940's television gear which is filled with Cornell Dubilier electrolytics which are the totally sealed, metal can types. These are the oil-filled caps in metal cans which are completely soldiered shut. My question is this: does anyone have an opinion on the lifespan of this type of cap. I've got a working iconoscope camera from 1943 in which I left this type of cap where necessary for physical reasons (mainly the video pre-amp.) I'm concerned about the current project simply because of function, reliability and physical difficulty of replacement. Any thoughts?