I am going to service and make rideable a Schwinn volare that was abandoned with virtually zero miles and assuming I like and ride it enough, I will be later probably cosmetically restoring it since it looks like it was pebbled by concrete. The cables and housings look good, great in fact, so I'm not really wanting to replace them. However, I'm seeing advice not to lubricate cables, which on modern lined units I can understand. These are from 1977, on a bike with dura Ace, but still 1977, which I'm seeing people say are unlined and require lubrication. Please advise.