I recapped a C64C I bought second hand recently, using premium Japanese 105C capacitors off the shelf on akihabara, minus the huge axial one I ordered a modern, extremely durable replacement for.

I tested every cap I removed, all of them nichicons from the mid 80s. They all measured to spec.

So it was kinda pointless at the end. Sure, it is going to be good for a few more decades, alongside the 1571 Ultimate II-L.

(yes, I replaced the original PSU. I bought separate modern, safe 9vac and 5vdc PSUs and an adapter to join them into the C64 power connector)