This week on Car Talk, from the wreckage of an old MG comes a new superhero, "Captain Destructo," ready to dope-slap stinko drivers--if he can ever get his car to run. Meanwhile, with Valentine's Day approaching, is it time for Beth to dump her boyfriend, after he unjustly accused her of damaging his Mustang? Elsewhere, Albee wants to sell his car to his mother-in-law, but may need to travel from Boston to Florida every month to change its bad spark plug. And, Roger's Toyota is emitting "Biblical" proportions of smoke after some oil changes. Is its "End Times" near? Also, should Donna leave her car running an extra 15 minutes on very cold nights to recharge the battery? What if 15 minutes turned into overnight, after her husband forgot to shut the car off? All this and more, this week on Car Talk.