Which Oil?

This is a new edition for November 2013 If you own a classic car, you face the problem of choosing the appropriate modern lubricants to use in its engine, gearbox, final drive and chassis. The original owner's handbook, if you have one, is probably of limited use as the lubricants it lists are probably no longer available. Even if you have some good information, you still have problems: are modern oils suitable? If yes, which ones? (Even within a single brand there may be five or six different o