I believe that sump oil is what we USns call crankcase oil, since I seem to remember that in foreign English the crankcase of a car is called the "sump". Right, Max? or am I having a nightmare instead of a recollection of recherche trivia?

If I'm right, I would, following Max's example, say that when it comes to tea, I would rather drink sump oil than that Earl Grey blend with the bergamot flavor. Any other tea is fine, as long as we're talking about real tea, not those herb brews labelled 'tea' such as chamomile, red zinger and other concoctions beloved of hippies.