This week on The Best of Car Talk, Bill parked his rental car on a beach, and discovered the next morning that the tide had rolled in—to the car. He’s bailed the water, but hasn’t told the rental company. Should he ‘fess up? Elsewhere, on a scale of 1 to 10, how stupid should Ryan feel about getting talked into an engine shampoo when he took his car for an oil change? How about 11? And, is a lucky doughnut enough to keep Tamatha’s brakes from burning up for a third time? All this and more this week on The Best of Car Talk.