This week on the Best of Car Talk, Stella is renting a highway billboard for a personal ad. What size font should she use to attract the right guy, and should she divulge she’s a lawyer? Elsewhere, Frank may need to offer a couple of spiral cut hams to find out why his car is squealing; Kelly was told never to change his transmission fluid, but that may not be his concern, since his truck appears to be out of transmission fluid; Chris’ brake pedal sank to the floor, but Tom and Ray are more interested in his askew cassette cases; and can Mabel’s screeching Subaru really be explained by, “Twinkle Twinkle Little Star, Power Equals I Squared R”? All this and more, this week on The Best of Car Talk.