This week on Car Talk, Ryan went for an oil change, and got talked into an "engine shampoo" (no creme rinse, please)! Now, he's become a walking punchline among his friends, and he's wondering if his engine isn't the only thing that got taken to the cleaners. Elsewhere, Marina loves her Jeep, but after 250,000 miles, is it finally time to deep six it in Lake Erie? Alicia needs help fixing her Saab without having to go on a second date with her mechanic; and did the Car Talk podcast really help save a marriage? All this, and lots more, on this week's cleansing hour of Car Talk.