What should I be lubing?

[OakLeaf]

I found this diagram which I hope helps.

http://www.highroadcycles.com/bikelubrication.php

That diagram shows a bike with flat bars and indicates (but doesn't describe) lubing the levers.

Someone told me recently that brifters should NOT be oiled, as it can dilute the grease in the mechanism, requiring the whole assembly to be rebuilt.

Is that correct?

I'd tend to agree with not breaking the chain any more often than necessary. Every time you push that pin through, it weakens the plates.