Poured Oil On Troubled Water

(I work in a major auto parts store. A customer comes in one day.)

Customer: “My ‘check oil’ light is on. Do you think I need some oil?”

Me: “I’d say so.”

(The customer gets one quart of our in-house oil brand and I ring her up. She dumps the oil into her engine, which instantly starts smoking. She then drives off, but comes back five minutes later.)

Customer: “That one bottle wasn’t enough. Do you think I need more?”