Robustness of vintage Rolex watches

[R.W.T.]

Originally Posted by tamiya

Oil technology has come a long way over last 40-70yrs, from mineral to synthetics. Even if the oil has stayed liquid not solidified AND it has STAYED WHERE IT SHOULD BE not migrated elsewhere, all moving mechanisms benefit from a clean & relube periodically.

I'd be more concerned about ageing seals though, if a daily wearer.

I couldn't have said that better.